Bump regexp_parser from 2.8.0 to 2.8.1 (#400)

Bumps [regexp_parser](https://github.com/ammar/regexp_parser) from 2.8.0 to 2.8.1.
- [Changelog](https://github.com/ammar/regexp_parser/blob/master/CHANGELOG.md)
- [Commits](ammar/regexp_parser@v2.8.0...v2.8.1)

---
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>

gems.locked

@@ -42,7 +42,7 @@ GEM
     parser (3.2.2.1)
       ast (~> 2.4.1)
     rainbow (3.1.1)
-    regexp_parser (2.8.0)
+    regexp_parser (2.8.1)
     rexml (3.2.5)
     rubocop (1.50.2)
       json (~> 2.3)