Bump ruby-enum from 0.8.0 to 0.9.0 (#16374)

Bumps [ruby-enum](https://github.com/dblock/ruby-enum) from 0.8.0 to 0.9.0.
- [Release notes](https://github.com/dblock/ruby-enum/releases)
- [Changelog](https://github.com/dblock/ruby-enum/blob/master/CHANGELOG.md)
- [Commits](https://github.com/dblock/ruby-enum/compare/v0.8.0...v0.9.0)

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Gemfile.lock

@@ -92,7 +92,7 @@ GEM
       ffi (~> 1.0)
     rexml (3.2.4)
     rouge (3.26.0)
-    ruby-enum (0.8.0)
+    ruby-enum (0.9.0)
       i18n
     ruby2_keywords (0.0.4)
     safe_yaml (1.0.5)