Log Message:
misc/ruby-bundler: update to 2.2.18

2.2.18 (May 25, 2021)

Security fixes:

* Fix dependency confusion issues with implicit dependencies #4609

Enhancements:
* Use simpler notation for generated required_ruby_version #4598
* Undeprecate bundle show #4586
* Make sure link to new issue uses the proper template #4592

Bug fixes:
* Fix platform specific gems being removed from the lockfile #4580