Bump rdoc from 6.6.2 to 6.6.3.1 in /apps/dashboard (#3454)

Bumps [rdoc](https://github.com/ruby/rdoc) from 6.6.2 to 6.6.3.1.
- [Release notes](https://github.com/ruby/rdoc/releases)
- [Changelog](https://github.com/ruby/rdoc/blob/master/History.rdoc)
- [Commits](ruby/rdoc@v6.6.2...v6.6.3.1)

---
updated-dependencies:
- dependency-name: rdoc
  dependency-type: indirect
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

apps/dashboard/Gemfile.lock

@@ -214,7 +214,7 @@ GEM
       rake (>= 12.2)
       thor (~> 1.0)
     rake (13.1.0)
-    rdoc (6.6.2)
+    rdoc (6.6.3.1)
       psych (>= 4.0.0)
     redcarpet (3.6.0)
     regexp_parser (2.9.0)