Bump rdoc from 6.10.0 to 6.11.0

Bumps [rdoc](https://github.com/ruby/rdoc) from 6.10.0 to 6.11.0.
- [Release notes](https://github.com/ruby/rdoc/releases)
- [Changelog](https://github.com/ruby/rdoc/blob/master/History.rdoc)
- [Commits](ruby/rdoc@v6.10.0...v6.11.0)

---
updated-dependencies:
- dependency-name: rdoc
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Gemfile.lock

@@ -122,7 +122,7 @@ GEM
     crass (1.0.6)
     cssbundling-rails (1.4.1)
       railties (>= 6.0.0)
-    date (3.3.4)
+    date (3.4.1)
     drb (2.2.1)
     erubi (1.13.0)
     execjs (2.9.1)
@@ -268,7 +268,7 @@ GEM
     rb-fsevent (0.11.2)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
-    rdoc (6.10.0)
+    rdoc (6.11.0)
       psych (>= 4.0.0)
     regexp_parser (2.10.0)
     reline (0.5.10)