Update to Ruby 3.0.0

.ruby-version

@@ -1 +1 @@
-2.6.2
+3.0.0

Gemfile

@@ -8,20 +8,21 @@ source "https://rubygems.org"
 #
 # This will help ensure the proper Jekyll version is running.
 # Happy Jekylling!
-gem "jekyll", "~> 3.9.0"
+gem "jekyll", "~> 3.9"
 
 # Install jekyll-brotli gem (https://github.com/philnash/jekyll-brotli/)
 # If you have any plugins, put them here!
 group :jekyll_plugins do
-  gem "jekyll-brotli", "~> 2.2.1"
-  gem "jekyll-sitemap", "~> 1.4.0"
+  gem "jekyll-brotli", "~> 2.2"
+  gem "jekyll-sitemap", "~> 1.4"
 end
 
 # Jekyll 3.9.0 now requires this explicitly installed, apparently
-gem "kramdown-parser-gfm", "~> 1.1.0"
+gem "kramdown-parser-gfm", "~> 1.1"
+gem "webrick", "~> 1.7"
 
 # Windows does not include zoneinfo files, so bundle the tzinfo-data gem
 gem "tzinfo-data", platforms: [:mingw, :mswin, :x64_mingw, :jruby]
 
 # Performance-booster for watching directories on Windows
-gem "wdm", "~> 0.1.0" if Gem.win_platform?
+gem "wdm", "~> 0.1" if Gem.win_platform?

Gemfile.lock

@@ -60,16 +60,18 @@ GEM
     sass-listen (4.0.0)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
+    webrick (1.7.0)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
-  jekyll (~> 3.9.0)
-  jekyll-brotli (~> 2.2.1)
-  jekyll-sitemap (~> 1.4.0)
-  kramdown-parser-gfm (~> 1.1.0)
+  jekyll (~> 3.9)
+  jekyll-brotli (~> 2.2)
+  jekyll-sitemap (~> 1.4)
+  kramdown-parser-gfm (~> 1.1)
   tzinfo-data
+  webrick (~> 1.7)
 
 BUNDLED WITH
    2.2.5