Bump rdoc from 6.2.1 to 6.3.2

Bumps [rdoc](https://github.com/ruby/rdoc) from 6.2.1 to 6.3.2.
- [Release notes](https://github.com/ruby/rdoc/releases)
- [Changelog](https://github.com/ruby/rdoc/blob/master/History.rdoc)
- [Commits](ruby/rdoc@v6.2.1...v6.3.2)

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

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

Gemfile.lock

@@ -121,7 +121,7 @@ GEM
     rainbow (3.0.0)
     rake (13.0.6)
     rchardet (1.8.0)
-    rdoc (6.2.1)
+    rdoc (6.3.2)
     regexp_parser (2.1.1)
     rexml (3.2.5)
     rspec (3.10.0)