Bump jekyll from 4.2.0 to 4.2.1

Bumps [jekyll](https://github.com/jekyll/jekyll) from 4.2.0 to 4.2.1.
- [Release notes](https://github.com/jekyll/jekyll/releases)
- [Changelog](https://github.com/jekyll/jekyll/blob/master/History.markdown)
- [Commits](jekyll/jekyll@v4.2.0...v4.2.1)

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

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

Gemfile

@@ -8,7 +8,7 @@ source "https://rubygems.org"
 #
 # This will help ensure the proper Jekyll version is running.
 # Happy Jekylling!
-gem "jekyll", "~> 4.2.0"
+gem "jekyll", "~> 4.2.1"
 
 # If you want to use GitHub Pages, remove the "gem "jekyll"" above and
 # uncomment the line below. To upgrade, run `bundle update github-pages`.

Gemfile.lock

@@ -28,7 +28,7 @@ GEM
     faraday-net_http_persistent (1.2.0)
     faraday-patron (1.0.0)
     faraday-rack (1.0.0)
-    ffi (1.15.3)
+    ffi (1.15.4)
     forwardable-extended (2.6.0)
     gapic-common (0.7.0)
       faraday (~> 1.3)
@@ -73,7 +73,7 @@ GEM
     http_parser.rb (0.6.0)
     i18n (1.8.10)
       concurrent-ruby (~> 1.0)
-    jekyll (4.2.0)
+    jekyll (4.2.1)
       addressable (~> 2.4)
       colorator (~> 1.0)
       em-websocket (~> 0.5)
@@ -131,7 +131,7 @@ GEM
     rb-inotify (0.10.1)
       ffi (~> 1.0)
     rexml (3.2.5)
-    rouge (3.26.0)
+    rouge (3.26.1)
     ruby2_keywords (0.0.5)
     safe_yaml (1.0.5)
     sassc (2.4.0)
@@ -143,15 +143,15 @@ GEM
       multi_json (~> 1.10)
     terminal-table (2.0.0)
       unicode-display_width (~> 1.1, >= 1.1.1)
-    unicode-display_width (1.7.0)
+    unicode-display_width (1.8.0)
     webrick (1.7.0)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
   google-cloud-container (~> 1.2, >= 1.2.2)
-  jekyll (~> 4.2.0)
+  jekyll (~> 4.2.1)
   jekyll-feed (~> 0.6)
   jekyll-last-modified-at
   jekyll-seo-tag