Bump rdoc from 6.5.0 to 6.6.1

Bumps [rdoc](https://github.com/ruby/rdoc) from 6.5.0 to 6.6.1.
- [Release notes](https://github.com/ruby/rdoc/releases)
- [Changelog](https://github.com/ruby/rdoc/blob/master/History.rdoc)
- [Commits](ruby/rdoc@v6.5.0...v6.6.1)

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

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

Gemfile

@@ -64,7 +64,7 @@ end
 group :test do
     gem 'test-unit-full', '~> 0.0.5'
     gem 'rspec', '~> 3.12'
-    gem 'rdoc', '~> 6.5'
+    gem 'rdoc', '~> 6.6'
     gem 'browserstack-local', '~> 1.4'
 
     gem 'irb', '~> 1.8'

Gemfile.lock

@@ -112,7 +112,7 @@ GEM
     pry-byebug (3.10.1)
       byebug (~> 11.0)
       pry (>= 0.13, < 0.15)
-    psych (5.1.0)
+    psych (5.1.1.1)
       stringio
     public_suffix (5.0.1)
     qr4r (0.6.1)
@@ -126,7 +126,7 @@ GEM
       rack (>= 1.3)
     rainbow (3.1.1)
     rake (13.0.6)
-    rdoc (6.5.0)
+    rdoc (6.6.1)
       psych (>= 4.0.0)
     regexp_parser (2.8.2)
     reline (0.3.8)
@@ -184,7 +184,7 @@ GEM
     slack-notifier (2.4.0)
     sqlite3 (1.6.7-arm64-darwin)
     sqlite3 (1.6.7-x86_64-linux)
-    stringio (3.0.5)
+    stringio (3.1.0)
     sync (0.5.0)
     term-ansicolor (1.7.1)
       tins (~> 1.0)
@@ -255,14 +255,14 @@ DEPENDENCIES
   mime-types (~> 3.4, >= 3.4.1)
   msfrpc-client (~> 1.1, >= 1.1.2)
   net-smtp
-  otr-activerecord (~> 2.1, >= 2.1.2)
+  otr-activerecord (= 2.1.2)
   parseconfig (~> 1.1, >= 1.1.2)
   pry-byebug (~> 3.10, >= 3.10.1)
   qr4r (~> 0.6.1)
   rack (~> 2.2)
   rack-protection (~> 3.0.5)
   rake (~> 13.0)
-  rdoc (~> 6.5)
+  rdoc (~> 6.6)
   rest-client (~> 2.1.0)
   rspec (~> 3.12)
   rubocop (~> 1.57.0)