Bump knapsack from 3.1.0 to 4.0.0

Bumps [knapsack](https://github.com/KnapsackPro/knapsack) from 3.1.0 to 4.0.0.
- [Release notes](https://github.com/KnapsackPro/knapsack/releases)
- [Changelog](https://github.com/KnapsackPro/knapsack/blob/master/CHANGELOG.md)
- [Commits](https://github.com/KnapsackPro/knapsack/compare/v3.1.0...v4.0.0)

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

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

Gemfile.lock

@@ -352,7 +352,7 @@ GEM
       multi_json (~> 1.0)
       rspec (>= 2.0, < 4.0)
     jwt (2.2.3)
-    knapsack (3.1.0)
+    knapsack (4.0.0)
       rake
     launchy (2.5.0)
       addressable (~> 2.7)
@@ -483,7 +483,7 @@ GEM
       rake (>= 0.13)
       thor (~> 1.0)
     rainbow (3.0.0)
-    rake (13.0.3)
+    rake (13.0.6)
     ransack (2.4.2)
       activerecord (>= 5.2.4)
       activesupport (>= 5.2.4)