Bump json in /docs in the bundler group across 1 directory

Bumps the bundler group with 1 update in the /docs directory: [json](https://github.com/ruby/json).


Updates `json` from 2.18.1 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@v2.18.1...v2.19.2)

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

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

Author: dependabot[bot]

docs/Gemfile.lock

@@ -218,7 +218,7 @@ GEM
       gemoji (>= 3, < 5)
       html-pipeline (~> 2.2)
       jekyll (>= 3.0, < 5.0)
-    json (2.18.1)
+    json (2.19.2)
     kramdown (2.4.0)
       rexml
     kramdown-parser-gfm (1.1.0)