Merge pull request #19 from apache/dependabot/bundler/site/nokogiri-1.13.2

Bump nokogiri from 1.12.5 to 1.13.2 in /site.

Verified by building/running site locally.
diff --git a/site/Gemfile.lock b/site/Gemfile.lock
index 4ad9bd0..99cb04a 100644
--- a/site/Gemfile.lock
+++ b/site/Gemfile.lock
@@ -98,11 +98,11 @@
     mime-types (3.2.2)
       mime-types-data (~> 3.2015)
     mime-types-data (3.2019.0331)
-    mini_portile2 (2.6.1)
+    mini_portile2 (2.8.0)
     minitest (5.11.3)
     multi_json (1.13.1)
-    nokogiri (1.12.5)
-      mini_portile2 (~> 2.6.1)
+    nokogiri (1.13.2)
+      mini_portile2 (~> 2.8.0)
       racc (~> 1.4)
     padrino-helpers (0.12.9)
       i18n (~> 0.6, >= 0.6.7)