Bump ruby_parser from 3.20.3 to 3.21.0

Bumps [ruby_parser](https://github.com/seattlerb/ruby_parser) from 3.20.3 to 3.21.0.
- [Changelog](https://github.com/seattlerb/ruby_parser/blob/master/History.rdoc)
- [Commits](seattlerb/ruby_parser@v3.20.3...v3.21.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

Gemfile.lock

@@ -106,7 +106,8 @@ GEM
       rubocop-ast (>= 0.4.0)
     ruby-progressbar (1.13.0)
     ruby2_keywords (0.0.5)
-    ruby_parser (3.20.3)
+    ruby_parser (3.21.0)
+      racc (~> 1.5)
       sexp_processor (~> 4.16)
     sexp_processor (4.17.1)
     simplecov (0.22.0)