Merge branch '345261_enable_ff_multiple_gpg_signatures' into 'master'

Enable FF multiple_gpg_signatures by default

See merge request gitlab-org/gitlab!74385

config/feature_flags/development/multiple_gpg_signatures.yml

@@ -5,4 +5,4 @@ rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/345261
 milestone: '14.5'
 type: development
 group: group::source code
-default_enabled: false
+default_enabled: true