fix: update cilium to v1.15.8 (patch)

[tvories-tbot[bot]]

This PR contains the following updates:

Package	Update	Change
quay.io/cilium/cilium	patch	v1.15.7 -> v1.15.8
quay.io/cilium/operator-generic	patch	v1.15.7 -> v1.15.8

---

[!WARNING] Some dependencies could not be looked up. Check the Dependency Dashboard for more information.

---

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 these updates again.

---

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

---

This PR has been generated by Renovate Bot.