Bump rdoc from 6.3.3 to 6.3.4.1

Bumps [rdoc](https://github.com/ruby/rdoc) from 6.3.3 to 6.3.4.1.
- [Release notes](https://github.com/ruby/rdoc/releases)
- [Changelog](https://github.com/ruby/rdoc/blob/master/History.rdoc)
- [Commits](ruby/rdoc@v6.3.3...v6.3.4.1)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Gemfile.lock

@@ -270,7 +270,7 @@ GEM
     rb-inotify (0.10.1)
       ffi (~> 1.0)
     rchardet (1.8.0)
-    rdoc (6.3.3)
+    rdoc (6.3.4.1)
     redcarpet (3.6.0)
     regexp_parser (2.6.1)
     request_store (1.5.1)