Update dependency knapsack to v4

This MR contains the following updates:

Package	Update	Change
knapsack	major	'~> 1.22.0' -> '~> 4.0.0'

MR created with the help of gitlab-org/frontend/renovate-gitlab-bot

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Release Notes

KnapsackPro/knapsack (knapsack)

v4.0.0

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• (breaking change) Remove support for RSpec 2.x. This change was already done by accident in the pull request when we added the RSpec context hook, which is available only since RSpec 3.x.

• Use RSpec example block argument instead of the global RSpec.current_example. This allows to run tests with the async-rspec gem.

  https://github.com/KnapsackPro/knapsack/pull/117

v3.1.0

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• Sorting Algorithm: round robin to least connections

  https://github.com/KnapsackPro/knapsack/pull/99

v3.0.0

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• (breaking change) Require minimum Ruby 2.2 version

  https://github.com/KnapsackPro/knapsack/pull/115

• (breaking change) Drop support for Minitest 4.x. Force to use minitest 5.x even on CI.

  https://github.com/KnapsackPro/knapsack/pull/114

• Replace Travis CI with GitHub Actions

  https://github.com/KnapsackPro/knapsack/pull/112

v2.0.0

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• (breaking change) Ruby 2.1 is a minimum required version

  https://github.com/KnapsackPro/knapsack/pull/113

• Use Ruby 3 and add small development adjustments in codebase

  https://github.com/KnapsackPro/knapsack/pull/110

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