chore(deps): update actions/cache action to v4 (!19)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [actions/cache](https://github.com/actions/cache) | action | major | `v1` -> `v4` |

---

### Release Notes

<details>
<summary>actions/cache (actions/cache)</summary>

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

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

### [`v3`](https://github.com/actions/cache/compare/v2...v3)

[Compare Source](https://github.com/actions/cache/compare/v2...v3)

### [`v2`](https://github.com/actions/cache/compare/v1...v2)

[Compare Source](https://github.com/actions/cache/compare/v1...v2)

</details>

---

### 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.

---

 - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box

---

This PR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate).
<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzOC45NS4wIiwidXBkYXRlZEluVmVyIjoiMzguOTUuMCIsInRhcmdldEJyYW5jaCI6Im1haW4iLCJsYWJlbHMiOltdfQ==-->

Reviewed-on: #19
Reviewed-by: Jan Gleytenhoover <krisellp9@gmail.com>
Co-authored-by: Renovate <renovate@kjan.de>
Co-committed-by: Renovate <renovate@kjan.de>

.gitea/workflows/build.yml

@@ -19,13 +19,13 @@ jobs:
         with:
           java-version: 21
       - name: Cache SonarQube packages
-        uses: actions/cache@v1
+        uses: actions/cache@v4
         with:
           path: ~/.sonar/cache
           key: ${{ runner.os }}-sonar
           restore-keys: ${{ runner.os }}-sonar
       - name: Cache Gradle packages
-        uses: actions/cache@v1
+        uses: actions/cache@v4
         with:
           path: ~/.gradle/caches
           key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle') }}