Bundler: Bundler v2.7: last release before Bundler 4

A major release of Bundler is finally happening, consolidating unreleased major changes that had been pending for a decade. It will be named Bundler 4 (skipping Bundler 3), so that we can release it in lockstep with RubyGems 4, making the version number of Bundler & RubyGems in sync from now on. Final Bundler 4 release will happen at the end of 2025, but for now we’re presenting Bundler 2.7 as the last big step towards this major release. Bundler 2.7 features a simulate_version configuration that will allow users to configure Bundler to behave exactly as Bundler 4 will behave, with all major breaking changes enabled by default. We encourage all users to enable this setting, experiment with Bundler 4, and leave us feedback. Community feedback is super important to us, and we’re still open to revisiting the changes that the final version will include.