Merge pull request #278 from docmeta/dependabot/bundler/rdoc-6.15.1

Bump rdoc from 6.15.0 to 6.15.1

Author: github-actions[bot]

Gemfile.lock

@@ -302,7 +302,7 @@ GEM
     rainbow (3.1.1)
     rake (13.3.1)
     rdiscount (2.2.7.3)
-    rdoc (6.15.0)
+    rdoc (6.15.1)
       erb
       psych (>= 4.0.0)
       tsort