[ruby-core:111689] [Ruby master Bug#19260] ruby/spec is failed with Ruby 3.3

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


Going in the order of https://github.com/ruby/ruby/commit/a236661a62dc89173dcdd9e071365929db1201a7

* `Encoding#replicate has been removed FAILED` I'll remove it and adjust guard, it's #18949
* `does not lose precision during the rounding process` I need to find if there is a ticket for it and otherwise file a new one
* `aises NoMemoryError when m > 0 and n != 0`: we need to decide if we fix #18518 or not, I'll add to dev meeting.
* `handles a lookbehind with ss characters`: #13671 not fixed yet, I posted a ping there, so can remain as `ruby_bug "#13671", ""..."3.4"` in the commit.

There were also some new specs for #19150 in ruby/spec, I switched to ArgumentError and adjusted the specs so that's done.

BTW, this is probably useful to track remaining items:
```
git grep -P 'ruby_bug.+"3.4"'
git grep -P 'ruby_version_is.+"3.4"'
```

----------------------------------------
Bug #19260: ruby/spec is failed with Ruby 3.3
https://bugs.ruby-lang.org/issues/19260#change-101089

* Author: hsbt (Hiroshi SHIBATA)
* Status: Open
* 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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