Bump knapsack_pro from 3.3.1 to 5.6.0

Bumps [knapsack_pro](https://github.com/KnapsackPro/knapsack_pro-ruby) from 3.3.1 to 5.6.0.
- [Changelog](https://github.com/KnapsackPro/knapsack_pro-ruby/blob/master/CHANGELOG.md)
- [Commits](https://github.com/KnapsackPro/knapsack_pro-ruby/compare/v3.3.1...v5.6.0)

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

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

Gemfile

@@ -76,7 +76,7 @@ group :development, :test do
   gem "factory_bot_rails", "~> 6.2.0"
   gem "faker", "~> 3.2.1"
   gem "i18n-tasks", "~> 0.9.37"
-  gem "knapsack_pro", "~> 3.3.1"
+  gem "knapsack_pro", "~> 5.6.0"
   gem "launchy", "~> 2.5.2"
   gem "letter_opener_web", "~> 2.0.0"
   gem "spring", "~> 2.1.1"