Bump actions/cache action to v4

[renovate]

This PR contains the following updates:

Package	Manager	Type	Update	Change
actions/cache	github-actions	action	major	v3.3.3 -> v4.0.0

---

Release Notes

actions/cache (actions/cache)

v4.0.0

Compare Source

What's Changed

• Update action to node20 by @​takost in https://github.com/actions/cache/pull/1284
• feat: save-always flag by @​to-s in https://github.com/actions/cache/pull/1242

New Contributors

• @​takost made their first contribution in https://github.com/actions/cache/pull/1284
• @​to-s made their first contribution in https://github.com/actions/cache/pull/1242

Full Changelog: actions/cache@v3...v4.0.0

---

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 is behind base branch, 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.