Bump jekyll from 3.9.1 to 3.9.4

Bumps [jekyll](https://github.com/jekyll/jekyll) from 3.9.1 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@v3.9.1...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

@@ -14,14 +14,14 @@ GEM
       i18n (>= 0.7, < 2)
       minitest (~> 5.1)
       tzinfo (~> 1.1)
-    addressable (2.8.0)
-      public_suffix (>= 2.0.2, < 5.0)
+    addressable (2.8.6)
+      public_suffix (>= 2.0.2, < 6.0)
     colorator (1.1.0)
     colorize (0.8.1)
-    concurrent-ruby (1.1.9)
-    em-websocket (0.5.2)
+    concurrent-ruby (1.2.3)
+    em-websocket (0.5.3)
       eventmachine (>= 0.12.9)
-      http_parser.rb (~> 0.6.0)
+      http_parser.rb (~> 0)
     eslintrb (2.1.0)
       execjs
       multi_json (>= 1.3)
@@ -30,7 +30,7 @@ GEM
       ffi (>= 1.15.0)
     eventmachine (1.2.7)
     execjs (2.8.1)
-    ffi (1.15.4)
+    ffi (1.16.3)
     forwardable-extended (2.6.0)
     hawkins (2.0.5)
       em-websocket (~> 0.5)
@@ -45,14 +45,14 @@ GEM
       typhoeus (~> 1.3)
       yell (~> 2.0)
     htmlentities (4.3.4)
-    http_parser.rb (0.6.0)
-    i18n (0.9.5)
+    http_parser.rb (0.8.0)
+    i18n (1.14.1)
       concurrent-ruby (~> 1.0)
-    jekyll (3.9.1)
+    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)
@@ -70,12 +70,12 @@ GEM
       listen (~> 3.0)
     json-schema (2.8.1)
       addressable (>= 2.4)
-    kramdown (2.3.1)
+    kramdown (2.4.0)
       rexml
     kramdown-parser-gfm (1.1.0)
       kramdown (~> 2.0)
-    liquid (4.0.3)
-    listen (3.7.0)
+    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)
@@ -89,14 +89,14 @@ GEM
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
     power_assert (2.0.1)
-    public_suffix (4.0.6)
+    public_suffix (5.0.4)
     racc (1.6.2)
     rake (13.0.6)
-    rb-fsevent (0.11.0)
+    rb-fsevent (0.11.2)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
-    rexml (3.2.5)
-    rouge (3.26.1)
+    rexml (3.2.6)
+    rouge (3.30.0)
     safe_yaml (1.0.5)
     sass (3.7.4)
       sass-listen (~> 4.0.0)