Bump knapsack_pro from 5.6.0 to 5.7.0

Bumps [knapsack_pro](https://github.com/KnapsackPro/knapsack_pro-ruby) from 5.6.0 to 5.7.0.
- [Changelog](https://github.com/KnapsackPro/knapsack_pro-ruby/blob/master/CHANGELOG.md)
- [Commits](https://github.com/KnapsackPro/knapsack_pro-ruby/compare/v5.6.0...v5.7.0)

---
updated-dependencies:
- dependency-name: knapsack_pro
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Gemfile.lock

@@ -305,7 +305,7 @@ GEM
       activerecord
       kaminari-core (= 1.2.2)
     kaminari-core (1.2.2)
-    knapsack_pro (5.6.0)
+    knapsack_pro (5.7.0)
       rake
     kramdown (2.4.0)
       rexml
@@ -727,7 +727,7 @@ DEPENDENCIES
   jquery-rails (~> 4.6.0)
   jquery-ui-rails (~> 6.0.1)
   kaminari (~> 1.2.2)
-  knapsack_pro (~> 5.6.0)
+  knapsack_pro (~> 5.7.0)
   launchy (~> 2.5.2)
   leaflet-rails (~> 1.9.3)
   letter_opener_web (~> 2.0.0)