Bump Ruby version to 2.7.7
CI has been using 2.7.6 since we don't specify a patch version. GDK is being updated in gitlab-org/gitlab-development-kit!2781 (merged).
Related to https://gitlab.com/gitlab-org/omnibus-gitlab/-/issues/7243
CI has been using 2.7.6 since we don't specify a patch version. GDK is being updated in gitlab-org/gitlab-development-kit!2781 (merged).
Related to https://gitlab.com/gitlab-org/omnibus-gitlab/-/issues/7243