Bump webrick from 1.8.2 to 1.9.0 (#199)

Author: dependabot[bot]

Gemfile

@@ -5,4 +5,4 @@ gem 'guard-jekyll-plus'
 gem 'guard-livereload'
 
 # Temporary install for: https://github.com/jekyll/jekyll/issues/8523
-gem "webrick", "~> 1.8"
+gem "webrick", "~> 1.9"

Gemfile.lock

@@ -296,7 +296,7 @@ GEM
       concurrent-ruby (~> 1.0)
     unicode-display_width (1.8.0)
     uri (0.13.0)
-    webrick (1.8.2)
+    webrick (1.9.0)
 
 PLATFORMS
   ruby
@@ -306,7 +306,7 @@ DEPENDENCIES
   guard
   guard-jekyll-plus
   guard-livereload
-  webrick (~> 1.8)
+  webrick (~> 1.9)
 
 BUNDLED WITH
    2.5.7