Build(deps): Bump regexp_parser from 2.5.0 to 2.6.0 (#18369)

Bumps [regexp_parser](https://github.com/ammar/regexp_parser) from 2.5.0 to 2.6.0.
- [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/v2.5.0...v2.6.0)

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

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Gemfile.lock

@@ -363,7 +363,7 @@ GEM
     redis (4.7.1)
     redis-namespace (1.9.0)
       redis (>= 4)
-    regexp_parser (2.5.0)
+    regexp_parser (2.6.0)
     request_store (1.5.1)
       rack (>= 1.4)
     rexml (3.2.5)