Make bundler-checksum work with RubyGems 3.5.6

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/144985



Merged-by: Rémy Coutable <remy@rymai.me>
Approved-by: Rémy Coutable <remy@rymai.me>
Co-authored-by: Stan Hu <stanhu@gmail.com>