Bump json from 2.15.1 to 2.15.2.1

Bumps [json](https://github.com/ruby/json) from 2.15.1 to 2.15.2.1.
- [Release notes](https://github.com/ruby/json/releases)
- [Changelog](https://github.com/ruby/json/blob/master/CHANGES.md)
- [Commits](ruby/json@v2.15.1...v2.15.2.1)

---
updated-dependencies:
- dependency-name: json
  dependency-version: 2.15.2.1
  dependency-type: indirect
...

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

Author: dependabot[bot]

Gemfile.lock

@@ -51,7 +51,7 @@ GEM
       pp (>= 0.6.0)
       rdoc (>= 4.0.0)
       reline (>= 0.4.2)
-    json (2.15.1)
+    json (2.15.2.1)
     language_server-protocol (3.17.0.5)
     lint_roller (1.1.0)
     listen (3.9.0)