Bump json from 2.9.0 to 2.9.1

Bumps [json](https://github.com/ruby/json) from 2.9.0 to 2.9.1.
- [Release notes](https://github.com/ruby/json/releases)
- [Changelog](https://github.com/ruby/json/blob/master/CHANGES.md)
- [Commits](ruby/json@v2.9.0...v2.9.1)

---
updated-dependencies:
- dependency-name: json
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Gemfile.lock

@@ -54,7 +54,7 @@ GEM
     irb (1.14.3)
       rdoc (>= 4.0.0)
       reline (>= 0.4.2)
-    json (2.9.0)
+    json (2.9.1)
     language_server-protocol (3.17.0.3)
     listen (3.9.0)
       rb-fsevent (~> 0.10, >= 0.10.3)