Bump webrick from 1.8.2 to 1.9.1

Bumps [webrick](https://github.com/ruby/webrick) from 1.8.2 to 1.9.1.
- [Release notes](https://github.com/ruby/webrick/releases)
- [Commits](ruby/webrick@v1.8.2...v1.9.1)

---
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

@@ -8,4 +8,4 @@ end
 # Performance-booster for watching directories on Windows
 gem "wdm", "~> 0.1.0", :install_if => Gem.win_platform?
 
-gem "webrick", "~> 1.8"
+gem "webrick", "~> 1.9"

Gemfile.lock

@@ -270,7 +270,7 @@ GEM
     unicode-display_width (1.8.0)
     uri (0.13.1)
     wdm (0.1.1)
-    webrick (1.8.2)
+    webrick (1.9.1)
 
 PLATFORMS
   ruby
@@ -279,7 +279,7 @@ PLATFORMS
 DEPENDENCIES
   github-pages
   wdm (~> 0.1.0)
-  webrick (~> 1.8)
+  webrick (~> 1.9)
 
 BUNDLED WITH
    2.2.22