[rubygems/rubygems] Test JRuby 10

Necessary changes to get tests passing are:

* Rewrite one "out of memory" error spec to not define a subclass inside
  a RSpec context block. Due to some [JRuby issue], that's failing in
  JRuby 10, so I rewrote the test so that the Bundler process really
  goes OOM and that class definition is not necessary.
* JRuby 10, even if Ruby 3.4-compatible, has not yet adapted backtraces
  to include receivers, so our tests need an special case for JRuby when
  detecting a test method call inside backtraces.
* Warbler test is upgraded to use JRuby 10. Getting it to pass needs [a
  PR] to warbler, so our test is temporarily pointing to that PR.

[JRuby issue]: https://github.com/jruby/jruby/issues/8838
[a PR]: https://github.com/jruby/warbler/pull/557

https://github.com/rubygems/rubygems/commit/edec85d4c3

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