Bump rdoc from 6.6.0 to 6.6.1

Bumps [rdoc](https://github.com/ruby/rdoc) from 6.6.0 to 6.6.1.
- [Release notes](https://github.com/ruby/rdoc/releases)
- [Changelog](https://github.com/ruby/rdoc/blob/master/History.rdoc)
- [Commits](https://github.com/ruby/rdoc/compare/v6.6.0...v6.6.1)

---
updated-dependencies:
- dependency-name: rdoc
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Gemfile.lock

@@ -836,7 +836,7 @@ GEM
     rb-inotify (0.10.1)
       ffi (~> 1.0)
     rbtree3 (0.7.1)
-    rdoc (6.6.0)
+    rdoc (6.6.1)
       psych (>= 4.0.0)
     recaptcha (5.16.0)
     redcarpet (3.6.0)