Build(deps): Bump rubocop-ast from 1.15.2 to 1.16.0 (#16020)

Bumps [rubocop-ast](https://github.com/rubocop/rubocop-ast) from 1.15.2 to 1.16.0.
- [Release notes](https://github.com/rubocop/rubocop-ast/releases)
- [Changelog](https://github.com/rubocop/rubocop-ast/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rubocop/rubocop-ast/compare/v1.15.2...v1.16.0)

---
updated-dependencies:
- dependency-name: rubocop-ast
  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

@@ -402,8 +402,8 @@ GEM
       rubocop-ast (>= 1.15.1, < 2.0)
       ruby-progressbar (~> 1.7)
       unicode-display_width (>= 1.4.0, < 3.0)
-    rubocop-ast (1.15.2)
-      parser (>= 3.0.1.1)
+    rubocop-ast (1.16.0)
+      parser (>= 3.1.1.0)
     rubocop-discourse (2.5.0)
       rubocop (>= 1.1.0)
       rubocop-rspec (>= 2.0.0)