Bump json from 2.7.0 to 2.7.1

Bumps [json](https://github.com/flori/json) from 2.7.0 to 2.7.1.
- [Release notes](https://github.com/flori/json/releases)
- [Changelog](https://github.com/flori/json/blob/master/CHANGES.md)
- [Commits](ruby/json@v2.7.0...v2.7.1)

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

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

Gemfile.lock

@@ -216,7 +216,7 @@ GEM
       rails-dom-testing (>= 1, < 3)
       railties (>= 4.2.0)
       thor (>= 0.14, < 2.0)
-    json (2.7.0)
+    json (2.7.1)
     jsonpath (1.1.5)
       multi_json
     jwt (2.7.1)