Bump rdoc from 7.0.3 to 7.1.0

Bumps [rdoc](https://github.com/ruby/rdoc) from 7.0.3 to 7.1.0.
- [Release notes](https://github.com/ruby/rdoc/releases)
- [Changelog](https://github.com/ruby/rdoc/blob/master/History.rdoc)
- [Commits](ruby/rdoc@v7.0.3...v7.1.0)

---
updated-dependencies:
- dependency-name: rdoc
  dependency-version: 7.1.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

Gemfile.lock

@@ -9,11 +9,13 @@ GEM
   specs:
     ast (2.4.3)
     benchmark (0.5.0)
+    cgi (0.5.1)
     coderay (1.1.3)
     concurrent-ruby (1.3.6)
     date (3.5.1)
     docile (1.4.1)
-    erb (6.0.1)
+    erb (4.0.4)
+      cgi (>= 0.3.3)
     i18n (1.14.8)
       concurrent-ruby (~> 1.0)
     io-console (0.8.2)
@@ -45,7 +47,7 @@ GEM
     racc (1.8.1)
     rainbow (3.1.1)
     rake (13.3.1)
-    rdoc (7.0.3)
+    rdoc (7.1.0)
       erb
       psych (>= 4.0.0)
       tsort