Bump webrick from 1.8.1 to 1.9.0

Bumps [webrick](https://github.com/ruby/webrick) from 1.8.1 to 1.9.0.
- [Release notes](https://github.com/ruby/webrick/releases)
- [Commits](ruby/webrick@v1.8.1...v1.9.0)

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

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

Author: dependabot[bot]

Gemfile

@@ -2,4 +2,4 @@ source "https://rubygems.org"
 
 gem 'github-pages', group: :jekyll_plugins
 
-gem "webrick", "~> 1.8"
+gem "webrick", "~> 1.9"

Gemfile.lock

@@ -265,14 +265,14 @@ GEM
       concurrent-ruby (~> 1.0)
     unicode-display_width (1.8.0)
     uri (0.13.0)
-    webrick (1.8.1)
+    webrick (1.9.0)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
   github-pages
-  webrick (~> 1.8)
+  webrick (~> 1.9)
 
 BUNDLED WITH
    2.3.15