Bump knapsack_pro from 8.3.0 to 8.4.0

Bumps [knapsack_pro](https://github.com/KnapsackPro/knapsack_pro-ruby) from 8.3.0 to 8.4.0.
- [Changelog](https://github.com/KnapsackPro/knapsack_pro-ruby/blob/main/CHANGELOG.md)
- [Commits](https://github.com/KnapsackPro/knapsack_pro-ruby/compare/v8.3.0...v8.4.0)

---
updated-dependencies:
- dependency-name: knapsack_pro
  dependency-version: 8.4.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Gemfile.lock

@@ -348,7 +348,7 @@ GEM
       activerecord
       kaminari-core (= 1.2.2)
     kaminari-core (1.2.2)
-    knapsack_pro (8.3.0)
+    knapsack_pro (8.4.0)
       rake
     kramdown (2.4.0)
       rexml
@@ -854,7 +854,7 @@ DEPENDENCIES
   image_processing (~> 1.14.0)
   invisible_captcha (~> 2.3.0)
   kaminari (~> 1.2.2)
-  knapsack_pro (~> 8.3.0)
+  knapsack_pro (~> 8.4.0)
   launchy (~> 3.1.1)
   letter_opener_web (~> 3.0.0)
   mdl (~> 0.13.0)