Update README to remove JRuby version notes

* JRuby 9.2.x has been EOL for a very long time, so there's no value in telling people to use a newer version.
* jruby/jruby#7106 was resolved with JRuby 9.4.0.0. All prior versions are EOL.
* jruby/jruby#7182 was determined to be a JDK issue and no longer occurs with more recent builds.

Author: headius

README.md

@@ -257,8 +257,6 @@ It is recommended to first get your build working on Ubuntu and macOS before try
 * The `PATH` contains [multiple compiler toolchains](https://github.com/ruby/setup-ruby/issues/19). Use `where.exe` to debug which tool is used.
 * For Ruby ≥ 2.4, MSYS2 is prepended to the `Path`, similar to what RubyInstaller2 does.
 * For Ruby < 2.4, the DevKit MSYS tools are installed and prepended to the `Path`.
-* Use JRuby 9.2.20+ on Windows (older versions have [bugs](https://github.com/ruby/setup-ruby/issues/18#issuecomment-889072695)).
-* JRuby on Windows has multiple issues ([jruby/jruby#7106](https://github.com/jruby/jruby/issues/7106), [jruby/jruby#7182](https://github.com/jruby/jruby/issues/7182)).
 * When compiling extension code, note that the packages required to build Ruby are included when using Windows 2022. Additional packages can be installed with [setup-ruby-pkgs](https://github.com/ruby/setup-ruby-pkgs) or via MSYS2's `pacman`. These packages may be required when installing or updating Ruby stdlib extension gems.
 
 ## Versioning