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

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
actions/checkout	action	major	v3.6.0 -> v4.0.0
actions/checkout	action	major	v3 -> v4

---

Release Notes

actions/checkout (actions/checkout)

### [`v4.0.0`](https://togithub.com/actions/checkout/blob/HEAD/CHANGELOG.md#v400) [Compare Source](https://togithub.com/actions/checkout/compare/v3.6.0...v4.0.0) - [Support fetching without the --progress option](https://togithub.com/actions/checkout/pull/1067) - [Update to node20](https://togithub.com/actions/checkout/pull/1436)

---

Configuration

📅 Schedule: Branch creation - "every weekday" (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 these updates again.

---

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

---

This PR has been generated by Mend Renovate. View repository job log here.

[softwarefactory-project-zuul[bot]]

Build succeeded. https://fedora.softwarefactory-project.io/zuul/buildset/d3d5e5d9b9ab4a1faa7802f4768358b6

:heavy_check_mark: fi-tox-mypy SUCCESS in 7m 21s :heavy_check_mark: fi-tox-lint SUCCESS in 4m 59s :heavy_check_mark: fi-tox-format SUCCESS in 7m 00s :heavy_check_mark: fi-tox-python38 SUCCESS in 8m 34s :heavy_check_mark: fi-tox-python39 SUCCESS in 10m 37s :heavy_check_mark: fi-tox-python310 SUCCESS in 8m 35s :heavy_check_mark: fi-tox-python311 SUCCESS in 10m 11s :heavy_check_mark: fi-tox-docs SUCCESS in 5m 10s :heavy_check_mark: fi-tox-bandit SUCCESS in 7m 01s :heavy_check_mark: fi-tox-diff-cover SUCCESS in 11m 20s