Bump regexp_parser from 2.9.0 to 2.9.1 (#398)

Bumps [regexp_parser](https://github.com/ammar/regexp_parser) from 2.9.0 to 2.9.1.
- [Changelog](https://github.com/ammar/regexp_parser/blob/master/CHANGELOG.md)
- [Commits](ammar/regexp_parser@v2.9.0...v2.9.1)

---
updated-dependencies:
- dependency-name: regexp_parser
  dependency-type: indirect
  update-type: version-update:semver-patch
...

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

Gemfile.lock

@@ -26,7 +26,7 @@ GEM
     racc (1.7.3)
     rainbow (3.1.1)
     rake (13.2.1)
-    regexp_parser (2.9.0)
+    regexp_parser (2.9.1)
     rexml (3.2.6)
     rspec (3.13.0)
       rspec-core (~> 3.13.0)