[Dependency] Bump json from 2.13.2 to 2.15.0

Bumps [json](https://github.com/ruby/json) from 2.13.2 to 2.15.0.
- [Release notes](https://github.com/ruby/json/releases)
- [Changelog](https://github.com/ruby/json/blob/master/CHANGES.md)
- [Commits](ruby/json@v2.13.2...v2.15.0)

---
updated-dependencies:
- dependency-name: json
  dependency-version: 2.15.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

Gemfile.lock

@@ -220,7 +220,7 @@ GEM
       gemoji (>= 3, < 5)
       html-pipeline (~> 2.2)
       jekyll (>= 3.0, < 5.0)
-    json (2.13.2)
+    json (2.15.0)
     kramdown (2.4.0)
       rexml
     kramdown-parser-gfm (1.1.0)