Bump lefthook from 1.7.18 to 1.7.21

Bumps [lefthook](https://github.com/evilmartians/lefthook) from 1.7.18 to 1.7.21.
- [Release notes](https://github.com/evilmartians/lefthook/releases)
- [Changelog](https://github.com/evilmartians/lefthook/blob/master/CHANGELOG.md)
- [Commits](evilmartians/lefthook@v1.7.18...v1.7.21)

---
updated-dependencies:
- dependency-name: lefthook
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Gemfile.lock

@@ -218,7 +218,7 @@ GEM
     jwt (2.9.0)
       base64
     language_server-protocol (3.17.0.3)
-    lefthook (1.7.18)
+    lefthook (1.7.21)
     listen (3.9.0)
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)