Bump rdoc from 7.0.2 to 7.0.3

Bumps [rdoc](https://github.com/ruby/rdoc) from 7.0.2 to 7.0.3.
- [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/v7.0.2...v7.0.3)

---
updated-dependencies:
- dependency-name: rdoc
  dependency-version: 7.0.3
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

Gemfile.lock

@@ -166,7 +166,7 @@ GEM
       rack (>= 1.3)
     rainbow (3.1.1)
     rake (13.3.1)
-    rdoc (7.0.2)
+    rdoc (7.0.3)
       erb
       psych (>= 4.0.0)
       tsort