Merge pull request ruby#2849 from ruby/dependabot/bundler/nokogiri-1.13.6

Bump nokogiri from 1.13.4 to 1.13.6

Author: hsbt

Gemfile.lock

@@ -50,7 +50,7 @@ GEM
     mercenary (0.4.0)
     mini_portile2 (2.8.0)
     minitest (5.15.0)
-    nokogiri (1.13.4)
+    nokogiri (1.13.6)
       mini_portile2 (~> 2.8.0)
       racc (~> 1.4)
     nokogumbo (2.0.5)