Update actions/setup-python action to v4

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/setup-python	action	major	v2 -> v4

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Release Notes

actions/setup-python

v4

Compare Source

v3

Compare Source

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Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

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• If you want to rebase/retry this PR, check this box

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[codecov-commenter]

Codecov Report

Merging #19 (5f9755f) into master (f856c6c) will not change coverage.
The diff coverage is n/a.

📣 This organization is not using Codecov’s GitHub App Integration. We recommend you install it so Codecov can continue to function properly for your repositories. Learn more

@@           Coverage Diff           @@
##           master      #19   +/-   ##
=======================================
  Coverage   78.94%   78.94%           
=======================================
  Files          13       13           
  Lines         380      380           
=======================================
  Hits          300      300           
  Misses         80       80           

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