Bump rdoc from 6.14.1 to 6.14.2

Bumps [rdoc](https://github.com/ruby/rdoc) from 6.14.1 to 6.14.2.
- [Release notes](https://github.com/ruby/rdoc/releases)
- [Changelog](https://github.com/ruby/rdoc/blob/master/History.rdoc)
- [Commits](https://github.com/ruby/rdoc/compare/v6.14.1...v6.14.2)

---
updated-dependencies:
- dependency-name: rdoc
  dependency-version: 6.14.2
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

Gemfile.lock

@@ -62,7 +62,7 @@ GEM
     em-websocket (0.5.3)
       eventmachine (>= 0.12.9)
       http_parser.rb (~> 0)
-    erb (5.0.1)
+    erb (5.0.2)
     erubis (2.7.0)
     espeak-ruby (1.1.0)
     event_emitter (0.2.6)
@@ -148,7 +148,7 @@ GEM
       rack (>= 1.3)
     rainbow (3.1.1)
     rake (13.3.0)
-    rdoc (6.14.1)
+    rdoc (6.14.2)
       erb
       psych (>= 4.0.0)
     regexp_parser (2.10.0)