Bump rdoc from 6.16.0 to 6.16.1

Bumps [rdoc](https://github.com/ruby/rdoc) from 6.16.0 to 6.16.1.
- [Release notes](https://github.com/ruby/rdoc/releases)
- [Changelog](https://github.com/ruby/rdoc/blob/master/History.rdoc)
- [Commits](ruby/rdoc@v6.16.0...v6.16.1)

---
updated-dependencies:
- dependency-name: rdoc
  dependency-version: 6.16.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

Gemfile.lock

@@ -303,7 +303,7 @@ GEM
     rainbow (3.1.1)
     rake (13.3.1)
     rdiscount (2.2.7.3)
-    rdoc (6.16.0)
+    rdoc (6.16.1)
       erb
       psych (>= 4.0.0)
       tsort