Bump jekyll from 3.6.3 to 3.8.6

Bumps [jekyll](https://github.com/jekyll/jekyll) from 3.6.3 to 3.8.6.
- [Release notes](https://github.com/jekyll/jekyll/releases)
- [Changelog](https://github.com/jekyll/jekyll/blob/master/History.markdown)
- [Commits](jekyll/jekyll@v3.6.3...v3.8.6)

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

Gemfile.lock

@@ -6,36 +6,60 @@ PATH
 GEM
   remote: https://rubygems.org/
   specs:
+    addressable (2.7.0)
+      public_suffix (>= 2.0.2, < 5.0)
     colorator (1.1.0)
-    ffi (1.9.24)
-    jekyll (3.6.3)
-      colorator
+    concurrent-ruby (1.1.6)
+    em-websocket (0.5.1)
+      eventmachine (>= 0.12.9)
+      http_parser.rb (~> 0.6.0)
+    eventmachine (1.2.7)
+    ffi (1.12.2)
+    forwardable-extended (2.6.0)
+    http_parser.rb (0.6.0)
+    i18n (0.9.5)
+      concurrent-ruby (~> 1.0)
+    jekyll (3.8.6)
+      addressable (~> 2.4)
+      colorator (~> 1.0)
+      em-websocket (~> 0.5)
+      i18n (~> 0.7)
       jekyll-sass-converter (~> 1.0)
-      jekyll-watch (~> 1.1)
-      kramdown (~> 1.3)
-      liquid (~> 3.0)
+      jekyll-watch (~> 2.0)
+      kramdown (~> 1.14)
+      liquid (~> 4.0)
       mercenary (~> 0.3.3)
-      rouge (~> 2.0)
+      pathutil (~> 0.9)
+      rouge (>= 1.7, < 4)
       safe_yaml (~> 1.0)
     jekyll-paginate (1.1.0)
     jekyll-sass-converter (1.5.2)
       sass (~> 3.4)
-    jekyll-watch (1.3.0)
+    jekyll-watch (2.2.1)
       listen (~> 3.0)
     kramdown (1.17.0)
-    liquid (3.0.6)
-    listen (3.1.5)
-      rb-inotify (~> 0.9, >= 0.9.7)
+    liquid (4.0.3)
+    listen (3.2.1)
+      rb-fsevent (~> 0.10, >= 0.10.3)
+      rb-inotify (~> 0.9, >= 0.9.10)
     mercenary (0.3.6)
     multi_json (1.12.1)
+    pathutil (0.16.2)
+      forwardable-extended (~> 2.6)
+    public_suffix (4.0.3)
     pygments.rb (1.2.0)
       multi_json (>= 1.0.0)
     rake (12.3.3)
-    rb-inotify (0.9.7)
-      ffi (>= 0.5.0)
-    rouge (2.2.1)
-    safe_yaml (1.0.4)
-    sass (3.5.3)
+    rb-fsevent (0.10.3)
+    rb-inotify (0.10.1)
+      ffi (~> 1.0)
+    rouge (3.16.0)
+    safe_yaml (1.0.5)
+    sass (3.7.4)
+      sass-listen (~> 4.0.0)
+    sass-listen (4.0.0)
+      rb-fsevent (~> 0.9, >= 0.9.4)
+      rb-inotify (~> 0.9, >= 0.9.7)
 
 PLATFORMS
   ruby