Build(deps): Bump json from 2.7.2 to 2.7.6 in /spec

Bumps [json](https://github.com/ruby/json) from 2.7.2 to 2.7.6.
- [Release notes](https://github.com/ruby/json/releases)
- [Changelog](https://github.com/ruby/json/blob/master/CHANGES.md)
- [Commits](ruby/json@v2.7.2...v2.7.6)

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

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

spec/Gemfile.lock

@@ -5,7 +5,7 @@ GEM
     bosh-template (2.4.0)
       semi_semantic (~> 1.2.0)
     diff-lcs (1.5.1)
-    json (2.7.5)
+    json (2.7.6)
     language_server-protocol (3.17.0.3)
     parallel (1.26.3)
     parser (3.3.6.0)