Add ruby-3.1.1 on Windows

Fix test, 3.1.1 has a newer RubyGems

Use the shipped Bundler on TruffleRuby 22.0

* To workaround oracle/truffleruby#2586

Allow bundler: none + bundle-cache: true to use the Bundler shipped w…

…ith that Ruby + the cache

Simplify to 22.0.0 in README (both work)

Add jruby-9.3.3.0

Fix title level in README

Fix typo

Try 'gem install --force bundler' on 3.1 Windows

Remove 2.5 from example as it is EOL