Upgrade: Bump json from 2.6.3 to 2.7.0

Bumps [json](https://github.com/flori/json) from 2.6.3 to 2.7.0.
- [Release notes](https://github.com/flori/json/releases)
- [Changelog](https://github.com/flori/json/blob/master/CHANGES.md)
- [Commits](ruby/json@v2.6.3...v2.7.0)

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

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

Gemfile.lock

@@ -13,7 +13,7 @@ GEM
     ast (2.4.2)
     colored (1.2)
     docile (1.4.0)
-    json (2.6.3)
+    json (2.7.0)
     language_server-protocol (3.17.0.3)
     mini_portile2 (2.8.5)
     minitest (5.20.0)