Bump rubocop-ast from 1.23.0 to 1.29.0 (#525)

Bumps [rubocop-ast](https://github.com/rubocop/rubocop-ast) from 1.23.0 to 1.29.0.
- [Release notes](https://github.com/rubocop/rubocop-ast/releases)
- [Changelog](https://github.com/rubocop/rubocop-ast/blob/master/CHANGELOG.md)
- [Commits](rubocop/rubocop-ast@v1.23.0...v1.29.0)

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

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

Gemfile.lock

@@ -61,8 +61,8 @@ GEM
       rubocop-ast (>= 1.23.0, < 2.0)
       ruby-progressbar (~> 1.7)
       unicode-display_width (>= 1.4.0, < 3.0)
-    rubocop-ast (1.23.0)
-      parser (>= 3.1.1.0)
+    rubocop-ast (1.29.0)
+      parser (>= 3.2.1.0)
     rubocop-performance (1.15.1)
       rubocop (>= 1.7.0, < 2.0)
       rubocop-ast (>= 0.4.0)