Bump webrick from 1.8.2 to 1.9.0

Bumps [webrick](https://github.com/ruby/webrick) from 1.8.2 to 1.9.0.
- [Release notes](https://github.com/ruby/webrick/releases)
- [Commits](ruby/webrick@v1.8.2...v1.9.0)

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

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

Gemfile

@@ -37,7 +37,7 @@ end
 
 group :development, :docs do
   gem 'commonmarker', '~> 0.23' # for markdown support in YARD
-  gem 'webrick', '~> 1.8' # for yard server
+  gem 'webrick', '~> 1.9' # for yard server
   gem 'yard', ['>= 0.9.27', '< 0.10']
   gem 'yard-coderay', '~> 0.1' # for syntax highlight support in YARD
 end

Gemfile.lock

@@ -58,7 +58,7 @@ GEM
     unicode-confusable (1.12.0)
     unicode-display_width (2.6.0)
     uri (0.13.0)
-    webrick (1.8.2)
+    webrick (1.9.0)
     yard (0.9.37)
     yard-coderay (0.1.0)
       coderay
@@ -80,7 +80,7 @@ DEPENDENCIES
   twitter_cldr (~> 6.12)
   unicode-confusable (~> 1.12)
   unisec!
-  webrick (~> 1.8)
+  webrick (~> 1.9)
   yard (>= 0.9.27, < 0.10)
   yard-coderay (~> 0.1)