https://github.com/ruby/syntax_suggest/commit/a81b92fcf2

[Bug #21847]

The reason this logic for different methods branches in the class instead of internally was to be eagerly aggressive about runtime performance. This code is currently only used once for the document where it's invoked ~N times (where N is number of lines):

```ruby
module SyntaxSuggest
  class CleanDocument
    # ...
    def join_trailing_slash!
      trailing_groups = @document.select(&:trailing_slash?).map do |code_line|
        take_while_including(code_line.index..) { |x| x.trailing_slash? }
      end
      join_groups(trailing_groups)
      self
    end
```

Since this is not currently a hot-spot I think merging the branches and using a case statement is a reasonable tradeoff and avoids the need to do specific version testing.

An alternative idea was presented in #241 of behavior-based testing for branch logic (which I would prefer), however, calling the code triggered requiring a `DelegateClass` when the `syntax_suggest/api` is being required.

https://github.com/ruby/syntax_suggest/commit/ab122c455f

It used to not emit this token type, but now it does.
So when a newer version of prism is present, we can fall back
to the same code that ripper uses.

Ref:
* https://github.com/ruby/ruby/pull/15914
* https://github.com/ruby/prism/pull/3859

https://github.com/ruby/syntax_suggest/commit/42a3b8f6cb

https://github.com/ruby/syntax_suggest/commit/54bb8ab330

	[PATCH] [ruby/timeout] Compatibility with Fiber scheduler. (https://github.com/ruby/timeout/pull/97)

	[Bug #21947]

	https://github.com/ruby/timeout/commit/55d7c84b50

Extends the @_init guard to def_method so that an ERB object created
via Marshal.load (which bypasses initialize) raises ArgumentError
instead of evaluating arbitrary source. def_module and def_class both
delegate to def_method and are covered by the same check.

Co-authored-by: Tristan Madani <TristanInSec@gmail.com>

[Backport #21187]