Bump rake from 13.3.1 to 13.4.2 in /docs

Bumps [rake](https://github.com/ruby/rake) from 13.3.1 to 13.4.2.
- [Release notes](https://github.com/ruby/rake/releases)
- [Changelog](https://github.com/ruby/rake/blob/master/History.rdoc)
- [Commits](ruby/rake@v13.3.1...v13.4.2)

---
updated-dependencies:
- dependency-name: rake
  dependency-version: 13.4.2
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

docs/Gemfile.lock

@@ -238,7 +238,7 @@ GEM
       tsort (>= 0.2)
       zeitwerk (~> 2.6)
     rainbow (3.1.1)
-    rake (13.3.1)
+    rake (13.4.2)
     rdoc (7.2.0)
       erb
       psych (>= 4.0.0)