Bump json from 2.18.0 to 2.19.2 in /jekyll

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]

jekyll/Gemfile.lock

@@ -62,7 +62,7 @@ GEM
       jekyll (>= 3.8, < 5.0)
     jekyll-watch (2.2.1)
       listen (~> 3.0)
-    json (2.18.0)
+    json (2.19.2)
     just-the-docs (0.12.0)
       jekyll (>= 3.8.5)
       jekyll-include-cache