Bump webrick from 1.9.0 to 1.9.1 (#510)

Bumps [webrick](https://github.com/ruby/webrick) from 1.9.0 to 1.9.1.
- [Release notes](https://github.com/ruby/webrick/releases)
- [Commits](ruby/webrick@v1.9.0...v1.9.1)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

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

@@ -277,7 +277,7 @@ PLATFORMS
 
 DEPENDENCIES
   github-pages
-  webrick (~> 1.8)
+  webrick (~> 1.9)
 
 BUNDLED WITH
    2.5.9