Merge branch 'attr_encrypted_ruby_3_1' into 'master'

Run attr_encrypted CI on Ruby 3.1

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/121783



Merged-by: Allen Cook <acook@gitlab.com>
Approved-by: Allen Cook <acook@gitlab.com>
Approved-by: Max Orefice <morefice@gitlab.com>
Co-authored-by: Thong Kuah <tkuah@gitlab.com>