[ruby-core:111703] [Ruby master Bug#19260] ruby/spec is failed with Ruby 3.3

Issue #19260 has been updated by Eregon (Benoit Daloze).


With `git grep -P '\b3\.3\b'`, I found:
```
lib/did_you_mean.rb:116:  # TODO: Remove on 3.3:
lib/did_you_mean.rb:135:  # TODO: Remove on 3.3:
```
cc @yuki24

```
re.c:3851:        rb_warn_deprecated_to_remove("3.3", "3rd argument to Regexp.new", "2nd argument");
```
handled by https://bugs.ruby-lang.org/issues/18797 and https://github.com/ruby/ruby/pull/7039

----------------------------------------
Bug #19260: ruby/spec is failed with Ruby 3.3
https://bugs.ruby-lang.org/issues/19260#change-101099

* Author: hsbt (Hiroshi SHIBATA)
* Status: Closed
* Priority: Normal
* Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN
----------------------------------------
After bumping version, we got the some fails with ruby/spec.

https://github.com/ruby/ruby/actions/runs/3778576412/jobs/6423166914

```
  1)
  Literal Regexps handles a lookbehind with ss characters ERROR
  RegexpError: invalid pattern in look-behind: /(?<!dss)/i
  /home/runner/work/ruby/ruby/src/spec/ruby/language/regexp_spec.rb:120:in `block (3 levels) in <top (required)>'
  /home/runner/work/ruby/ruby/src/spec/ruby/language/regexp_spec.rb:4:in `<top (required)>'
  
  2)
  Float#round does not lose precision during the rounding process FAILED
  Expected 767573.18758 to have same value and type as 767573.18759
  /home/runner/work/ruby/ruby/src/spec/ruby/core/float/round_spec.rb:148:in `block (3 levels) in <top (required)>'
  /home/runner/work/ruby/ruby/src/spec/ruby/core/float/round_spec.rb:3:in `<top (required)>'
  
  3)
  Encoding#replicate has been removed FAILED
  Expected #<Encoding:US-ASCII>.respond_to? :replicate, true
  to be falsy but was true
  /home/runner/work/ruby/ruby/src/spec/ruby/core/encoding/replicate_spec.rb:72:in `block (3 levels) in <top (required)>'
  /home/runner/work/ruby/ruby/src/spec/ruby/core/encoding/replicate_spec.rb:4:in `<top (required)>'
```



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