Bump knapsack_pro from 2.6.0 to 2.11.0

Bumps [knapsack_pro](https://github.com/KnapsackPro/knapsack_pro-ruby) from 2.6.0 to 2.11.0.
- [Release notes](https://github.com/KnapsackPro/knapsack_pro-ruby/releases)
- [Changelog](https://github.com/KnapsackPro/knapsack_pro-ruby/blob/master/CHANGELOG.md)
- [Commits](https://github.com/KnapsackPro/knapsack_pro-ruby/compare/v2.6.0...v2.11.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Gemfile.lock

@@ -343,7 +343,7 @@ GEM
       activerecord
       kaminari-core (= 1.2.1)
     kaminari-core (1.2.1)
-    knapsack_pro (2.6.0)
+    knapsack_pro (2.11.0)
       rake
     kramdown (2.3.1)
       rexml
@@ -740,7 +740,7 @@ DEPENDENCIES
   jquery-rails (~> 4.4.0)
   jquery-ui-rails (~> 6.0.1)
   kaminari (~> 1.2.1)
-  knapsack_pro (~> 2.6.0)
+  knapsack_pro (~> 2.11.0)
   launchy (~> 2.5.0)
   letter_opener_web (~> 1.4.0)
   mdl (~> 0.11.0)