docs: Bump ruby gems (#954)

Looks like there is an issue with the current docs ruby gems versions,
this change bump them.

Signed-off-by: Quique Llorente <[email protected]>

docs/Gemfile.lock

@@ -4,46 +4,62 @@ GEM
     addressable (2.8.0)
       public_suffix (>= 2.0.2, < 5.0)
     colorator (1.1.0)
-    concurrent-ruby (1.1.7)
-    em-websocket (0.5.2)
+    concurrent-ruby (1.1.9)
+    em-websocket (0.5.3)
       eventmachine (>= 0.12.9)
-      http_parser.rb (~> 0.6.0)
-    ethon (0.12.0)
-      ffi (>= 1.3.0)
+      http_parser.rb (~> 0)
+    ethon (0.15.0)
+      ffi (>= 1.15.0)
     eventmachine (1.2.7)
-    faraday (1.1.0)
+    faraday (1.8.0)
+      faraday-em_http (~> 1.0)
+      faraday-em_synchrony (~> 1.0)
+      faraday-excon (~> 1.1)
+      faraday-httpclient (~> 1.0.1)
+      faraday-net_http (~> 1.0)
+      faraday-net_http_persistent (~> 1.1)
+      faraday-patron (~> 1.0)
+      faraday-rack (~> 1.0)
       multipart-post (>= 1.2, < 3)
-      ruby2_keywords
-    ffi (1.13.1)
+      ruby2_keywords (>= 0.0.4)
+    faraday-em_http (1.0.0)
+    faraday-em_synchrony (1.0.0)
+    faraday-excon (1.1.0)
+    faraday-httpclient (1.0.1)
+    faraday-net_http (1.0.1)
+    faraday-net_http_persistent (1.2.0)
+    faraday-patron (1.0.0)
+    faraday-rack (1.0.0)
+    ffi (1.15.4)
     forwardable-extended (2.6.0)
     gemoji (3.0.1)
-    html-proofer (3.16.0)
+    html-proofer (3.19.3)
       addressable (~> 2.3)
       mercenary (~> 0.3)
-      nokogumbo (~> 2.0)
+      nokogiri (~> 1.12)
       parallel (~> 1.3)
       rainbow (~> 3.0)
       typhoeus (~> 1.3)
       yell (~> 2.0)
-    http_parser.rb (0.6.0)
-    i18n (1.8.5)
+    http_parser.rb (0.8.0)
+    i18n (1.8.11)
       concurrent-ruby (~> 1.0)
-    jekyll (4.1.1)
+    jekyll (4.2.1)
       addressable (~> 2.4)
       colorator (~> 1.0)
       em-websocket (~> 0.5)
       i18n (~> 1.0)
       jekyll-sass-converter (~> 2.0)
       jekyll-watch (~> 2.0)
-      kramdown (~> 2.1)
+      kramdown (~> 2.3)
       kramdown-parser-gfm (~> 1.0)
       liquid (~> 4.0)
       mercenary (~> 0.4.0)
       pathutil (~> 0.9)
       rouge (~> 3.0)
       safe_yaml (~> 1.0)
-      terminal-table (~> 1.8)
-    jekyll-feed (0.15.1)
+      terminal-table (~> 2.0)
+    jekyll-feed (0.16.0)
       jekyll (>= 3.7, < 5.0)
     jekyll-gist (1.5.0)
       octokit (~> 4.2)
@@ -57,7 +73,7 @@ GEM
       sassc (> 2.0.1, < 3.0)
     jekyll-sitemap (1.4.0)
       jekyll (>= 3.7, < 5.0)
-    jekyll-spaceship (0.9.4)
+    jekyll-spaceship (0.10.2)
       gemoji (~> 3.0)
       jekyll (>= 3.6, < 5.0)
       nokogiri (~> 1.6)
@@ -71,13 +87,13 @@ GEM
     kramdown-parser-gfm (1.1.0)
       kramdown (~> 2.0)
     liquid (4.0.3)
-    listen (3.4.0)
+    listen (3.7.0)
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
     mercenary (0.4.0)
     mini_i18n (0.8.0)
     mini_portile2 (2.6.1)
-    minimal-mistakes-jekyll (4.20.2)
+    minimal-mistakes-jekyll (4.24.0)
       jekyll (>= 3.7, < 5.0)
       jekyll-feed (~> 0.1)
       jekyll-gist (~> 1.5)
@@ -88,34 +104,32 @@ GEM
     nokogiri (1.12.5)
       mini_portile2 (~> 2.6.1)
       racc (~> 1.4)
-    nokogumbo (2.0.2)
-      nokogiri (~> 1.8, >= 1.8.4)
-    octokit (4.19.0)
+    octokit (4.21.0)
       faraday (>= 0.9)
       sawyer (~> 0.8.0, >= 0.5.3)
-    parallel (1.19.2)
+    parallel (1.21.0)
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
     public_suffix (4.0.6)
-    racc (1.5.2)
+    racc (1.6.0)
     rainbow (3.0.0)
-    rb-fsevent (0.10.4)
+    rb-fsevent (0.11.0)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
     rexml (3.2.5)
-    rouge (3.24.0)
-    ruby2_keywords (0.0.2)
+    rouge (3.27.0)
+    ruby2_keywords (0.0.5)
     safe_yaml (1.0.5)
     sassc (2.4.0)
       ffi (~> 1.9)
     sawyer (0.8.2)
       addressable (>= 2.3.5)
       faraday (> 0.8, < 2.0)
-    terminal-table (1.8.0)
+    terminal-table (2.0.0)
       unicode-display_width (~> 1.1, >= 1.1.1)
     typhoeus (1.4.0)
       ethon (>= 0.9.0)
-    unicode-display_width (1.7.0)
+    unicode-display_width (1.8.0)
     yell (2.2.2)
 
 PLATFORMS
@@ -130,4 +144,4 @@ DEPENDENCIES
   minimal-mistakes-jekyll
 
 BUNDLED WITH
-   2.1.4
+   2.2.22