Update request_store gem to 1.5.1
What does this MR do and why?
Changelog: https://github.com/steveklabnik/request_store/compare/v1.5.0...v1.5.1
We should update the version to 1.5.1 to be closer to master
. The default branch contains Ruby 3 CI builds: https://github.com/steveklabnik/request_store.
The difference between 1.5.1 and master contains only CI configuration changes: https://github.com/steveklabnik/request_store/compare/v1.5.1...master