app/models/label.rb: Remove use of MD5
In https://gitlab.com/gitlab-org/gitlab/blob/2c37b583966ff5e89e7ba7106567f9bba9fb0ed1/app/models/label.rb#L165, we seem to be computing an MD5 for a color. We need to remove the use of MD5 for FIPS compliance.
./db/fixtures/development/04_labels.rb
also uses this.
@acroitor Can we safely change this to SHA256?
Edited by Stan Hu