Bump jekyll from 3.9.0 to 3.9.4

Bumps [jekyll](https://github.com/jekyll/jekyll) from 3.9.0 to 3.9.4.
- [Release notes](https://github.com/jekyll/jekyll/releases)
- [Changelog](https://github.com/jekyll/jekyll/blob/master/History.markdown)
- [Commits](jekyll/jekyll@v3.9.0...v3.9.4)

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

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

Gemfile.lock

@@ -9,8 +9,8 @@ GIT
 GEM
   remote: https://rubygems.org/
   specs:
-    addressable (2.8.0)
-      public_suffix (>= 2.0.2, < 5.0)
+    addressable (2.8.6)
+      public_suffix (>= 2.0.2, < 6.0)
     algolia_html_extractor (2.6.4)
       json (~> 2.0)
       nokogiri (~> 1.10)
@@ -21,29 +21,25 @@ GEM
     cldr-plurals-runtime-rb (1.1.0)
     colorator (1.1.0)
     concurrent-ruby (1.2.3)
-    em-websocket (0.5.2)
+    em-websocket (0.5.3)
       eventmachine (>= 0.12.9)
-      http_parser.rb (~> 0.6.0)
+      http_parser.rb (~> 0)
     eventmachine (1.2.7)
     eventmachine (1.2.7-java)
     eventmachine (1.2.7-x64-mingw32)
     eventmachine (1.2.7-x86-mingw32)
-    ffi (1.15.0)
-    ffi (1.15.0-java)
-    ffi (1.15.0-x64-mingw32)
-    ffi (1.15.0-x86-mingw32)
+    ffi (1.16.3)
     filesize (0.2.0)
     forwardable-extended (2.6.0)
-    http_parser.rb (0.6.0)
-    http_parser.rb (0.6.0-java)
+    http_parser.rb (0.8.0)
     httpclient (2.8.3)
-    i18n (0.9.5)
+    i18n (1.14.1)
       concurrent-ruby (~> 1.0)
-    jekyll (3.9.0)
+    jekyll (3.9.4)
       addressable (~> 2.4)
       colorator (~> 1.0)
       em-websocket (~> 0.5)
-      i18n (~> 0.7)
+      i18n (>= 0.7, < 2)
       jekyll-sass-converter (~> 1.0)
       jekyll-watch (~> 2.0)
       kramdown (>= 1.17, < 3)
@@ -80,8 +76,8 @@ GEM
       rexml
     kramdown-parser-gfm (1.1.0)
       kramdown (~> 2.0)
-    liquid (4.0.3)
-    listen (3.5.1)
+    liquid (4.0.4)
+    listen (3.8.0)
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
     mercenary (0.3.6)
@@ -97,14 +93,14 @@ GEM
       forwardable-extended (~> 2.6)
     posix-spawn (0.3.15)
     progressbar (1.11.0)
-    public_suffix (4.0.6)
+    public_suffix (5.0.4)
     racc (1.6.2)
     racc (1.6.2-java)
-    rb-fsevent (0.10.4)
+    rb-fsevent (0.11.2)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
-    rexml (3.2.5)
-    rouge (3.26.0)
+    rexml (3.2.6)
+    rouge (3.30.0)
     safe_yaml (1.0.5)
     sass (3.7.4)
       sass-listen (~> 4.0.0)