chore(deps): update actions/setup-python action to v5 (#37)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [actions/setup-python](https://github.com/actions/setup-python) | action | major | `v4` -> `v5` |

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### Release Notes

<details>
<summary>actions/setup-python (actions/setup-python)</summary>

### [`v5`](https://github.com/actions/setup-python/compare/v4...v5)

[Compare Source](https://github.com/actions/setup-python/compare/v4...v5)

</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 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).
<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0MC4xMC40IiwidXBkYXRlZEluVmVyIjoiNDAuMTAuNCIsInRhcmdldEJyYW5jaCI6Im1haW4iLCJsYWJlbHMiOltdfQ==-->

Reviewed-on: #37
Co-authored-by: Renovate Bot <renovate@horstenkamp.eu>
Co-committed-by: Renovate Bot <renovate@horstenkamp.eu>

.gitea/workflows/lint.yaml

@@ -11,7 +11,7 @@ jobs:
       SPECIFIC_BRANCH: chore/update-pre-commit
     steps:
     - uses: actions/checkout@v4
-    - uses: actions/setup-python@v4
+    - uses: actions/setup-python@v5
     - run: pip install pre-commit
       shell: bash
     - name: pre-commit

.gitea/workflows/maintenance.yaml

@@ -16,7 +16,7 @@ jobs:
     - uses: actions/checkout@v4
       with:
         token: ${{ secrets.REPO_TOKEN_SERVER }}
-    - uses: actions/setup-python@v4
+    - uses: actions/setup-python@v5
     - run: pip install pre-commit
       shell: bash
     - run: pre-commit autoupdate