Fix warnings on Ruby 4

[thdaraujo]

Fix warning when running tests. And consider updating bundler version as well?

 Failure

/home/runner/.rubies/ruby-head/lib/ruby/gems/4.0.0+0/gems/bundler-2.4.22/lib/bundler/rubygems_ext.rb:241: warning: already initialized constant Gem::Platform::JAVA
/home/runner/.rubies/ruby-head/lib/ruby/4.0.0+0/rubygems/platform.rb:279: warning: previous definition of JAVA was here
/home/runner/.rubies/ruby-head/lib/ruby/gems/4.0.0+0/gems/bundler-2.4.22/lib/bundler/rubygems_ext.rb:242: warning: already initialized constant Gem::Platform::MSWIN
/home/runner/.rubies/ruby-head/lib/ruby/4.0.0+0/rubygems/platform.rb:280: warning: previous definition of MSWIN was here
/home/runner/.rubies/ruby-head/lib/ruby/gems/4.0.0+0/gems/bundler-2.4.22/lib/bundler/rubygems_ext.rb:243: warning: already initialized constant Gem::Platform::MSWIN64
/home/runner/.rubies/ruby-head/lib/ruby/4.0.0+0/rubygems/platform.rb:281: warning: previous definition of MSWIN64 was here
/home/runner/.rubies/ruby-head/lib/ruby/gems/4.0.0+0/gems/bundler-2.4.22/lib/bundler/rubygems_ext.rb:244: warning: already initialized constant Gem::Platform::MINGW
/home/runner/.rubies/ruby-head/lib/ruby/4.0.0+0/rubygems/platform.rb:282: warning: previous definition of MINGW was here
/home/runner/.rubies/ruby-head/lib/ruby/gems/4.0.0+0/gems/bundler-2.4.22/lib/bundler/rubygems_ext.rb:245: warning: already initialized constant Gem::Platform::X64_MINGW
/home/runner/.rubies/ruby-head/lib/ruby/4.0.0+0/rubygems/platform.rb:284: warning: previous definition of X64_MINGW was here
/home/runner/.rubies/ruby-head/lib/ruby/gems/4.0.0+0/gems/bundler-2.4.22/lib/bundler/rubygems_ext.rb:247: warning: already initialized constant Gem::Platform::WINDOWS
/home/runner/.rubies/ruby-head/lib/ruby/4.0.0+0/rubygems/platform.rb:286: warning: previous definition of WINDOWS was here
/home/runner/.rubies/ruby-head/lib/ruby/gems/4.0.0+0/gems/bundler-2.4.22/lib/bundler/rubygems_ext.rb:248: warning: already initialized constant Gem::Platform::X64_LINUX
/home/runner/.rubies/ruby-head/lib/ruby/4.0.0+0/rubygems/platform.rb:287: warning: previous definition of X64_LINUX was here
/home/runner/.rubies/ruby-head/lib/ruby/gems/4.0.0+0/gems/bundler-2.4.22/lib/bundler/rubygems_ext.rb:249: warning: already initialized constant Gem::Platform::X64_LINUX_MUSL
/home/runner/.rubies/ruby-head/lib/ruby/4.0.0+0/rubygems/platform.rb:288: warning: previous definition of X64_LINUX_MUSL was here
/home/runner/.rubies/ruby-head/lib/ruby/gems/4.0.0+0/gems/bundler-2.4.22/lib/bundler/runtime.rb:304:in 'Bundler::Runtime#check_for_activated_spec!': You have already activated minitest 5.26.1, but your Gemfile requires minitest 5.26.2. Prepending `bundle exec` to your command may solve this. (Gem::LoadError)
	from /home/runner/.rubies/ruby-head/lib/ruby/gems/4.0.0+0/gems/bundler-2.4.22/lib/bundler/runtime.rb:25:in 'block in Bundler::Runtime#setup'
	from /home/runner/.rubies/ruby-head/lib/ruby/gems/4.0.0+0/gems/bundler-2.4.22/lib/bundler/spec_set.rb:165:in 'Array#each'
	from /home/runner/.rubies/ruby-head/lib/ruby/gems/4.0.0+0/gems/bundler-2.4.22/lib/bundler/spec_set.rb:165:in 'Bundler::SpecSet#each'
	from /home/runner/.rubies/ruby-head/lib/ruby/gems/4.0.0+0/gems/bundler-2.4.22/lib/bundler/runtime.rb:24:in 'Enumerable#map'
	from /home/runner/.rubies/ruby-head/lib/ruby/gems/4.0.0+0/gems/bundler-2.4.22/lib/bundler/runtime.rb:24:in 'Bundler::Runtime#setup'
	from /home/runner/.rubies/ruby-head/lib/ruby/gems/4.0.0+0/gems/bundler-2.4.22/lib/bundler/inline.rb:66:in 'block (2 levels) in Object#gemfile'
	from /home/runner/.rubies/ruby-head/lib/ruby/gems/4.0.0+0/gems/bundler-2.4.22/lib/bundler/settings.rb:142:in 'Bundler::Settings#temporary'
	from /home/runner/.rubies/ruby-head/lib/ruby/gems/4.0.0+0/gems/bundler-2.4.22/lib/bundler/inline.rb:51:in 'block in Object#gemfile'
	from /home/runner/.rubies/ruby-head/lib/ruby/gems/4.0.0+0/gems/bundler-2.4.22/lib/bundler.rb:403:in 'block in Bundler.with_unbundled_env'
	from /home/runner/.rubies/ruby-head/lib/ruby/gems/4.0.0+0/gems/bundler-2.4.22/lib/bundler.rb:649:in 'Bundler.with_env'
	from /home/runner/.rubies/ruby-head/lib/ruby/gems/4.0.0+0/gems/bundler-2.4.22/lib/bundler.rb:403:in 'Bundler.with_unbundled_