[ruby-core:115068] [Ruby master Bug#19929] Warnings for `mutex_m`, `drb` and `base64` appears while the gem spec has explicit dependencies

Issue #19929 has been reported by yahonda (Yasuo Honda).

----------------------------------------
Bug #19929: Warnings for `mutex_m`, `drb` and `base64` appears while the gem spec has explicit dependencies
https://bugs.ruby-lang.org/issues/19929

* Author: yahonda (Yasuo Honda)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.3.0dev (2023-10-17T11:07:57Z :detached: 2a8ac8ead5) [x86_64-linux]
* Backport: 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN
----------------------------------------
Running some of Ruby on Rails unit test raises these warnings while it has explicit add_dependency entries https://github.com/rails/rails/blob/ae6fa7a048d0a0f79b0f8dd8566c7d499fd6f616/activesupport/activesupport.gemspec#L42-L45
 

```
warning: mutex_m which will be not part of the default gems since Ruby 3.4.0. Add mutex_m to your Gemfile.
warning: drb which will be not part of the default gems since Ruby 3.4.0. Add drb to your Gemfile.
warning: base64 which will be not part of the default gems since Ruby 3.4.0. Add base64 to your Gemfile.
```

### Steps to reproduce

```
git clone https://github.com/rails/rails
cd rails
rm Gemfile.lock
bundle install
cd railties
RAILS_STRICT_WARNING=1 bin/test test/engine/commands_test.rb test/engine/test_test.rb
```

### Expected behavior
It should finish successfully.

### Actual behavior
It raises these warnings. Rails has the `RAILS_STRICT_WARNING` environment variable to fail if any warnings.

```
warning: mutex_m which will be not part of the default gems since Ruby 3.4.0. Add mutex_m to your Gemfile.
warning: drb which will be not part of the default gems since Ruby 3.4.0. Add drb to your Gemfile.
warning: base64 which will be not part of the default gems since Ruby 3.4.0. Add base64 to your Gemfile.
```

```
$ ruby -v
ruby 3.3.0dev (2023-10-17T11:07:57Z :detached: 2a8ac8ead5) [x86_64-linux]
$ RAILS_STRICT_WARNING=1 bin/test test/engine/commands_test.rb test/engine/test_test.rb
/home/yahonda/src/github.com/rails/rails/activesupport/lib/active_support/notifications/fanout.rb:3: warning: mutex_m which will be not part of the default gems since Ruby 3.4.0. Add mutex_m to your Gemfile.
/home/yahonda/src/github.com/rails/rails/activesupport/lib/active_support/testing/parallelization.rb:3: warning: drb which will be not part of the default gems since Ruby 3.4.0. Add drb to your Gemfile.
/home/yahonda/src/github.com/rails/rails/activesupport/lib/active_support/message_encryptor.rb:4: warning: base64 which will be not part of the default gems since Ruby 3.4.0. Add base64 to your Gemfile.
/home/yahonda/src/github.com/rails/rails/activesupport/lib/active_support/testing/strict_warnings.rb:33:in `warn': /home/yahonda/src/github.com/rails/rails/activesupport/lib/active_support/message_encryptor.rb:4: warning: base64 which will be not part of the default gems since Ruby 3.4.0. Add base64 to your Gemfile. (RuntimeError)
	from <internal:warning>:51:in `warn'
	from /home/yahonda/.rbenv/versions/trunk/lib/ruby/3.3.0+0/bundler/rubygems_integration.rb:248:in `block (2 levels) in replace_require'
	from /home/yahonda/src/github.com/rails/rails/activesupport/lib/active_support/message_encryptor.rb:4:in `<top (required)>'
	from /home/yahonda/.rbenv/versions/trunk/lib/ruby/3.3.0+0/bundler/rubygems_integration.rb:250:in `require'
	from /home/yahonda/.rbenv/versions/trunk/lib/ruby/3.3.0+0/bundler/rubygems_integration.rb:250:in `block (2 levels) in replace_require'
	from /home/yahonda/src/github.com/rails/rails/activesupport/lib/active_support/encrypted_file.rb:5:in `<top (required)>'
	from /home/yahonda/.rbenv/versions/trunk/lib/ruby/3.3.0+0/bundler/rubygems_integration.rb:250:in `require'
	from /home/yahonda/.rbenv/versions/trunk/lib/ruby/3.3.0+0/bundler/rubygems_integration.rb:250:in `block (2 levels) in replace_require'
	from /home/yahonda/src/github.com/rails/rails/activesupport/lib/active_support/encrypted_configuration.rb:4:in `<top (required)>'
	from /home/yahonda/.rbenv/versions/trunk/lib/ruby/3.3.0+0/bundler/rubygems_integration.rb:250:in `require'
	from /home/yahonda/.rbenv/versions/trunk/lib/ruby/3.3.0+0/bundler/rubygems_integration.rb:250:in `block (2 levels) in replace_require'
	from /home/yahonda/src/github.com/rails/rails/railties/lib/rails/application.rb:9:in `<top (required)>'
	from /home/yahonda/.rbenv/versions/trunk/lib/ruby/3.3.0+0/bundler/rubygems_integration.rb:250:in `require'
	from /home/yahonda/.rbenv/versions/trunk/lib/ruby/3.3.0+0/bundler/rubygems_integration.rb:250:in `block (2 levels) in replace_require'
	from /home/yahonda/src/github.com/rails/rails/railties/lib/rails.rb:15:in `<top (required)>'
	from /home/yahonda/.rbenv/versions/trunk/lib/ruby/3.3.0+0/bundler/rubygems_integration.rb:250:in `require'
	from /home/yahonda/.rbenv/versions/trunk/lib/ruby/3.3.0+0/bundler/rubygems_integration.rb:250:in `block (2 levels) in replace_require'
	from /home/yahonda/src/github.com/rails/rails/railties/lib/rails/all.rb:5:in `<top (required)>'
	from /home/yahonda/.rbenv/versions/trunk/lib/ruby/3.3.0+0/bundler/rubygems_integration.rb:250:in `require'
	from /home/yahonda/.rbenv/versions/trunk/lib/ruby/3.3.0+0/bundler/rubygems_integration.rb:250:in `block (2 levels) in replace_require'
	from /home/yahonda/src/github.com/rails/rails/railties/test/abstract_unit.rb:15:in `<top (required)>'
	from /home/yahonda/.rbenv/versions/trunk/lib/ruby/3.3.0+0/bundler/rubygems_integration.rb:250:in `require'
	from /home/yahonda/.rbenv/versions/trunk/lib/ruby/3.3.0+0/bundler/rubygems_integration.rb:250:in `block (2 levels) in replace_require'
	from /home/yahonda/src/github.com/rails/rails/railties/test/engine/commands_test.rb:3:in `<top (required)>'
	from /home/yahonda/.rbenv/versions/trunk/lib/ruby/3.3.0+0/bundler/rubygems_integration.rb:250:in `require'
	from /home/yahonda/.rbenv/versions/trunk/lib/ruby/3.3.0+0/bundler/rubygems_integration.rb:250:in `block (2 levels) in replace_require'
	from /home/yahonda/src/github.com/rails/rails/railties/lib/rails/test_unit/runner.rb:51:in `block in load_tests'
	from /home/yahonda/src/github.com/rails/rails/railties/lib/rails/test_unit/runner.rb:51:in `each'
	from /home/yahonda/src/github.com/rails/rails/railties/lib/rails/test_unit/runner.rb:51:in `load_tests'
	from /home/yahonda/src/github.com/rails/rails/railties/lib/rails/test_unit/runner.rb:43:in `run'
	from /home/yahonda/src/github.com/rails/rails/tools/test.rb:18:in `<top (required)>'
	from bin/test:5:in `require_relative'
	from bin/test:5:in `<main>'
$ ruby -v
ruby 3.3.0dev (2023-10-17T11:07:57Z :detached: 2a8ac8ead5) [x86_64-linux]
$ gem -v
3.5.0.dev
$ bundle -v
Bundler version 2.5.0.dev
$
```



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