Bump regexp_parser from 1.8.0 to 1.8.1 (#14928)

Bumps [regexp_parser](https://github.com/ammar/regexp_parser) from 1.8.0 to 1.8.1.
- [Release notes](https://github.com/ammar/regexp_parser/releases)
- [Changelog](https://github.com/ammar/regexp_parser/blob/master/CHANGELOG.md)
- [Commits](https://github.com/ammar/regexp_parser/compare/v1.8.0...v1.8.1

)

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Gemfile.lock

@@ -499,7 +499,7 @@ GEM
       redis-store (>= 1.2, < 2)
     redis-store (1.9.0)
       redis (>= 4, < 5)
-    regexp_parser (1.8.0)
+    regexp_parser (1.8.1)
     request_store (1.5.0)
       rack (>= 1.4)
     responders (3.0.1)