Bump json from 2.8.2 to 2.9.0 in /.overcommit

Bumps [json](https://github.com/ruby/json) from 2.8.2 to 2.9.0.
- [Release notes](https://github.com/ruby/json/releases)
- [Changelog](https://github.com/ruby/json/blob/master/CHANGES.md)
- [Commits](ruby/json@v2.8.2...v2.9.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

.overcommit/Gemfile.lock

@@ -15,7 +15,7 @@ GEM
     childprocess (5.1.0)
       logger (~> 1.5)
     iniparse (1.5.0)
-    json (2.8.2)
+    json (2.9.0)
     language_server-protocol (3.17.0.3)
     logger (1.6.1)
     overcommit (0.64.1)