jekyll: Update the dependencies (security, CVE-2020-14001)

This fixes a potential security issue (reported by bundler-audit) by
updating kramdown to 2.3.0 for CVE-2020-14001 [0].

[0]: https://github.com/advisories/GHSA-mqm2-cgpr-p4m6

pkgs/applications/misc/jekyll/full/Gemfile.lock

@@ -17,7 +17,7 @@ GEM
       execjs
     coffee-script-source (1.12.2)
     colorator (1.1.0)
-    concurrent-ruby (1.1.6)
+    concurrent-ruby (1.1.7)
     em-websocket (0.5.1)
       eventmachine (>= 0.12.9)
       http_parser.rb (~> 0.6.0)
@@ -29,11 +29,11 @@ GEM
     ffi (1.13.1)
     forwardable-extended (2.6.0)
     gemoji (3.0.1)
-    html-pipeline (2.13.0)
+    html-pipeline (2.14.0)
       activesupport (>= 2)
       nokogiri (>= 1.4)
     http_parser.rb (0.6.0)
-    i18n (1.8.3)
+    i18n (1.8.5)
       concurrent-ruby (~> 1.0)
     jekyll (4.1.1)
       addressable (~> 2.4)
@@ -55,7 +55,7 @@ GEM
     jekyll-coffeescript (2.0.0)
       coffee-script (~> 2.2)
       coffee-script-source (~> 1.12)
-    jekyll-feed (0.14.0)
+    jekyll-feed (0.15.0)
       jekyll (>= 3.7, < 5.0)
     jekyll-gist (1.5.0)
       octokit (~> 4.2)
@@ -77,7 +77,7 @@ GEM
       gemoji (~> 3.0)
       html-pipeline (~> 2.2)
       jekyll (>= 3.0, < 5.0)
-    kramdown (2.2.1)
+    kramdown (2.3.0)
       rexml
     kramdown-parser-gfm (1.1.0)
       kramdown (~> 2.0)
@@ -97,7 +97,7 @@ GEM
     mini_portile2 (2.4.0)
     minitest (5.14.1)
     multipart-post (2.1.1)
-    nokogiri (1.10.9)
+    nokogiri (1.10.10)
       mini_portile2 (~> 2.4.0)
     octokit (4.18.0)
       faraday (>= 0.9)
@@ -110,7 +110,7 @@ GEM
       ffi (~> 1.0)
     rdoc (6.2.1)
     rexml (3.2.4)
-    rouge (3.20.0)
+    rouge (3.22.0)
     safe_yaml (1.0.5)
     sassc (2.4.0)
       ffi (~> 1.9)
@@ -125,7 +125,7 @@ GEM
       thread_safe (~> 0.1)
     unicode-display_width (1.7.0)
     yajl-ruby (1.4.1)
-    zeitwerk (2.3.0)
+    zeitwerk (2.4.0)
 
 PLATFORMS
   ruby