⬆️ Update actions/cache action to v4

[renovate[bot]]

This PR contains the following updates:

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

---

Release Notes

actions/cache (actions/cache)

### [`v4`](https://togithub.com/actions/cache/compare/v3...v4) [Compare Source](https://togithub.com/actions/cache/compare/v3...v4)

---

Configuration

📅 Schedule: Branch creation - "after 11am on friday" in timezone Europe/Amsterdam, 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.

---

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

---

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

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (2f8d7b7) 97.95% compared to head (fa5022a) 97.95%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #148 +/- ## ======================================= Coverage 97.95% 97.95% ======================================= Files 30 30 Lines 784 784 ======================================= Hits 768 768 Misses 16 16 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.