chore(deps): update actions/metadata-action action to v5 (#20)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [actions/metadata-action](https://gitea.ocram85.com/actions/metadata-action) | action | major | `v4` -> `v5` |

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### Release Notes

<details>
<summary>actions/metadata-action (actions/metadata-action)</summary>

### [`v5`](https://gitea.ocram85.com/actions/metadata-action/compare/v4...v5)

[Compare Source](https://gitea.ocram85.com/actions/metadata-action/compare/v4...v5)

</details>

---

### Configuration

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🚦 **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.

---

 - [ ] <!-- 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).
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Co-authored-by: OCram85 <marco.blessing@googlemail.com>
Reviewed-on: #20
Reviewed-by: OCram85 <marco.blessing@googlemail.com>
Co-authored-by: renovate-bot <renovate@ocram85.com>
Co-committed-by: renovate-bot <renovate@ocram85.com>

.gitea/workflows/ci.yaml

@@ -20,7 +20,7 @@ jobs:
       -
         name: Docker meta
         id: meta
-        uses: https://gitea.ocram85.com/actions/metadata-action@v4
+        uses: https://gitea.ocram85.com/actions/metadata-action@v5
         with:
           images: |
             gitea.ocram85.com/ocram85/swarmproxy