Build(deps): Bump rubocop from 1.28.2 to 1.29.0 (#16678)

Bumps [rubocop](https://github.com/rubocop/rubocop) from 1.28.2 to 1.29.0.
- [Release notes](https://github.com/rubocop/rubocop/releases)
- [Changelog](https://github.com/rubocop/rubocop/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rubocop/rubocop/compare/v1.28.2...v1.29.0)

---
updated-dependencies:
- dependency-name: rubocop
  dependency-type: indirect
  update-type: version-update:semver-minor
...

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

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

Gemfile.lock

@@ -411,12 +411,12 @@ GEM
       activesupport (>= 3.1, < 7.1)
       json-schema (~> 2.2)
       railties (>= 3.1, < 7.1)
-    rubocop (1.28.2)
+    rubocop (1.29.0)
       parallel (~> 1.10)
       parser (>= 3.1.0.0)
       rainbow (>= 2.2.2, < 4.0)
       regexp_parser (>= 1.8, < 3.0)
-      rexml
+      rexml (>= 3.2.5, < 4.0)
       rubocop-ast (>= 1.17.0, < 2.0)
       ruby-progressbar (~> 1.7)
       unicode-display_width (>= 1.4.0, < 3.0)