Use FIPS-compliant encryption for gitaly-ruby in FIPS mode
With https://gitlab.com/gitlab-org/labkit-ruby/-/merge_requests/90, labkit-ruby will swap uses of Ruby's Digest module in favor of OpenSSL::Digest to ensure FIPS compliance.
Relates to https://gitlab.com/gitlab-org/gitlab/-/issues/360174
Edited by Stan Hu