chore(deps): update actions/setup-python action to v5.1.0 (#734)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [actions/setup-python](https://togithub.com/actions/setup-python) |
action | minor | `v5.0.0` -> `v5.1.0` |

---

### Release Notes

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

###
[`v5.1.0`](https://togithub.com/actions/setup-python/compare/v5.0.0...v5.1.0)

[Compare
Source](https://togithub.com/actions/setup-python/compare/v5.0.0...v5.1.0)

</details>

---

### Configuration

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are satisfied.

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rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update
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---

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.github/workflows/validation.yml

@@ -53,7 +53,7 @@ jobs:
         uses: actions/[email protected]
 
       - name: Set up Python ${{ env.DEFAULT_PYTHON }}
-        uses: actions/setup-python@v5.0.0
+        uses: actions/setup-python@v5.1.0
         with:
           python-version: ${{ env.DEFAULT_PYTHON }}
 
@@ -88,7 +88,7 @@ jobs:
       - name: Check out code from GitHub
         uses: actions/[email protected]
       - name: Setup Python ${{ env.DEFAULT_PYTHON }}
-        uses: actions/setup-python@v5.0.0
+        uses: actions/setup-python@v5.1.0
         with:
           python-version: ${{ env.DEFAULT_PYTHON }}
       - name: Install requirements