Bump json from 2.18.0 to 2.19.2 in /docs

Bumps [json](https://github.com/ruby/json) from 2.18.0 to 2.19.2.
- [Release notes](https://github.com/ruby/json/releases)
- [Changelog](https://github.com/ruby/json/blob/master/CHANGES.md)
- [Commits](ruby/json@v2.18.0...v2.19.2)

---
updated-dependencies:
- dependency-name: json
  dependency-version: 2.19.2
  dependency-type: indirect
...

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

Author: dependabot[bot]

docs/Gemfile.lock

@@ -83,7 +83,7 @@ GEM
       gemoji (>= 3, < 5)
       html-pipeline (~> 2.2)
       jekyll (>= 3.0, < 5.0)
-    json (2.18.0)
+    json (2.19.2)
     just-the-docs (0.10.1)
       jekyll (>= 3.8.5)
       jekyll-include-cache