Bump json from 2.19.2 to 2.19.9 in /test/rb

Bumps [json](https://github.com/ruby/json) from 2.19.2 to 2.19.9.
- [Release notes](https://github.com/ruby/json/releases)
- [Changelog](https://github.com/ruby/json/blob/master/CHANGES.md)
- [Commits](ruby/json@v2.19.2...v2.19.9)

---
updated-dependencies:
- dependency-name: json
  dependency-version: 2.19.9
  dependency-type: indirect
...

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

Author: dependabot[bot]

test/rb/Gemfile.lock

@@ -68,7 +68,7 @@ GEM
     io-endpoint (0.17.2)
     io-event (1.19.1)
     io-stream (0.13.1)
-    json (2.19.2)
+    json (2.19.9)
     language_server-protocol (3.17.0.5)
     lint_roller (1.1.0)
     localhost (1.8.0)