Updates ruby version 2.5 to 3.0 (lib/gitlab/ci/templates/Ruby.gitlab-ci.yml)
Updates ruby version 2.5 to the latest (3.0 or 3.0.1) since Ruby 2.5 was just EOL'ed on 2021-03-31.
Most parts of code were already updated in #327579 (closed).
CI templates
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CI template lib/gitlab/ci/templates/Ruby.gitlab-ci.yml
GitLab.com
gitlab.com
Note: Configuration of Note: Out of scope from Community contribution since these are NOT disclosed even for Core Team