Bump rdoc from 6.5.0 to 6.5.1.1

Bumps [rdoc](https://github.com/ruby/rdoc) from 6.5.0 to 6.5.1.1.
- [Release notes](https://github.com/ruby/rdoc/releases)
- [Changelog](https://github.com/ruby/rdoc/blob/master/History.rdoc)
- [Commits](ruby/rdoc@v6.5.0...v6.5.1.1)

---
updated-dependencies:
- dependency-name: rdoc
  dependency-type: direct:development
...

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

Gemfile

@@ -8,5 +8,5 @@ source "https://rubygems.org"
 group :development do
   gem "rspec", "~> 3.12.0"
   gem "rake", "~> 13.0.6"
-  gem "rdoc", "~> 6.5.0"
+  gem "rdoc", "~> 6.5.1"
 end

Gemfile.lock

@@ -2,10 +2,10 @@ GEM
   remote: https://rubygems.org/
   specs:
     diff-lcs (1.5.0)
-    psych (5.1.0)
+    psych (5.1.2)
       stringio
     rake (13.0.6)
-    rdoc (6.5.0)
+    rdoc (6.5.1.1)
       psych (>= 4.0.0)
     rspec (3.12.0)
       rspec-core (~> 3.12.0)
@@ -20,14 +20,14 @@ GEM
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.12.0)
     rspec-support (3.12.1)
-    stringio (3.0.6)
+    stringio (3.1.0)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
   rake (~> 13.0.6)
-  rdoc (~> 6.5.0)
+  rdoc (~> 6.5.1)
   rspec (~> 3.12.0)
 
 BUNDLED WITH