v6.5.0

What's Changed

Fix tests, add Truffleruby head to CI by @gogainda in https://github.com/gazay/gon/pull/267
Stop using Travis CI and switch to GitHub Actions by @willnet in https://github.com/gazay/gon/pull/276
Fix changelog links for 6.4.0 by @dee-see in https://github.com/gazay/gon/pull/264
Ruby 3.4 frozen string issues by @yuri-zubov in https://github.com/gazay/gon/pull/277
Remove badges we no longer use in README by @willnet in https://github.com/gazay/gon/pull/278
Remove ostruct dependency by @krororo in https://github.com/gazay/gon/pull/279
Reduce gem size by excluding test files by @yuri-zubov in https://github.com/gazay/gon/pull/280
Update MultiJSON link in README by @willnet in https://github.com/gazay/gon/pull/281
Replace deprecated File.exists? with File.exist? by @krororo in https://github.com/gazay/gon/pull/282
Add .rspec to run individual test files by @willnet in https://github.com/gazay/gon/pull/283
Stop stubbing Rails version in tests by @willnet in https://github.com/gazay/gon/pull/284
Make broad-scope hooks and method definitions active only where needed by @willnet in https://github.com/gazay/gon/pull/285
Fix a failure in thread_safe tests when using truffleruby by @willnet in https://github.com/gazay/gon/pull/286
Remove no longer used @request_env in tests by @willnet in https://github.com/gazay/gon/pull/287
Remove useless stubs in tests by @willnet in https://github.com/gazay/gon/pull/288
Bump version to 6.5.0 by @willnet in https://github.com/gazay/gon/pull/289

@gogainda made their first contribution in https://github.com/gazay/gon/pull/267
@willnet made their first contribution in https://github.com/gazay/gon/pull/276
@dee-see made their first contribution in https://github.com/gazay/gon/pull/264
@yuri-zubov made their first contribution in https://github.com/gazay/gon/pull/277
@krororo made their first contribution in https://github.com/gazay/gon/pull/279

Full Changelog: https://github.com/gazay/gon/compare/v6.4.0...v6.5.0