Build(deps): Bump json from 2.9.0 to 2.9.1 in /spec

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: indirect
  update-type: version-update:semver-patch
...

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

spec/Gemfile.lock

@@ -5,7 +5,7 @@ GEM
     bosh-template (2.4.0)
       semi_semantic (~> 1.2.0)
     diff-lcs (1.5.1)
-    json (2.9.0)
+    json (2.9.1)
     language_server-protocol (3.17.0.3)
     parallel (1.26.3)
     parser (3.3.6.0)