Update actions/setup-python action to v5 (#266)

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This PR contains the following updates:

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

---

### Release Notes

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

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

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

</details>

---

### Configuration

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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

---

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.github/workflows/ci.yml

@@ -22,7 +22,7 @@ jobs:
         with:
           # Needed for docs to discover gh-pages branch
           fetch-depth: 0
-      - uses: actions/setup-python@v4
+      - uses: actions/setup-python@v5
         id: setup-python
         with:
           python-version: ${{ env.PYTHON_VERSION }}

.github/workflows/publish.yml

@@ -23,7 +23,7 @@ jobs:
         with:
           # Needed for docs to discover gh-pages branch
           fetch-depth: 0
-      - uses: actions/setup-python@v4
+      - uses: actions/setup-python@v5
         id: setup-python
         with:
           python-version: ${{ env.PYTHON_VERSION }}