Update dependency sass-loader to v12

This MR contains the following updates:

Package	Type	Update	Change
sass-loader	devDependencies	major	^10.1.1 -> ^12.0.0

⚠ Release Notes retrieval for this MR were skipped because no github.com credentials were available. If you are self-hosted, please see this instruction.

---

Configuration

📅 Schedule: At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever MR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this MR and you won't be reminded about this update again.

---

• If you want to rebase/retry this MR, check this box.

---

This MR has been generated by Renovate Bot.