Update mheap/github-action-required-labels action to v4

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
mheap/github-action-required-labels	action	major	v3 -> v4

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Release Notes

mheap/github-action-required-labels

### [`v4`](https://togithub.com/mheap/github-action-required-labels/releases/tag/v4) [Compare Source](https://togithub.com/mheap/github-action-required-labels/compare/v3...v4) Tag that always points to the latest commit in the v4.x.x series of releases

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Configuration

📅 Schedule: Branch creation - "on the first day of the month" (UTC), 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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This PR has been generated by Mend Renovate. View repository job log here.

[codecov[bot]]

Codecov Report

Merging #152 (7577bd1) into main (696693b) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #152   +/-   ##
=======================================
  Coverage   98.97%   98.97%           
=======================================
  Files           7        7           
  Lines         390      390           
=======================================
  Hits          386      386           
  Misses          4        4           

Flag	Coverage Δ
macos-latest	?
ubuntu-latest	98.97% <ø> (ø)
windows-latest	98.97% <ø> (ø)

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