chore(deps): update actions/checkout action to v4

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
actions/checkout	action	major	v3 -> v4

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Release Notes

actions/checkout (actions/checkout)

### [`v4`](https://togithub.com/actions/checkout/blob/HEAD/CHANGELOG.md#v400) [Compare Source](https://togithub.com/actions/checkout/compare/v3...v4) - [Support fetching without the --progress option](https://togithub.com/actions/checkout/pull/1067) - [Update to node20](https://togithub.com/actions/checkout/pull/1436)

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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

Patch coverage has no change and project coverage change: -10.81% :warning:

Comparison is base (85c3ffa) 100.00% compared to head (962e9be) 89.19%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #128 +/- ## ============================================ - Coverage 100.00% 89.19% -10.81% ============================================ Files 8 8 Lines 287 287 Branches 54 39 -15 ============================================ - Hits 287 256 -31 - Misses 0 30 +30 - Partials 0 1 +1 ``` [see 1 file with indirect coverage changes](https://app.codecov.io/gh/kiwicom/pytest-recording/pull/128/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=kiwicom)

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