⬆️👨‍💻 Update actions/attest-build-provenance action to v3.1.0 (#315)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
|
[actions/attest-build-provenance](https://redirect.github.com/actions/attest-build-provenance)
| action | minor | `v3` -> `v3.1.0` |

---

### Release Notes

<details>
<summary>actions/attest-build-provenance
(actions/attest-build-provenance)</summary>

###
[`v3.1.0`](https://redirect.github.com/actions/attest-build-provenance/compare/v3.0.0...v3.1.0)

[Compare
Source](https://redirect.github.com/actions/attest-build-provenance/compare/v3.0.0...v3.1.0)

</details>

---

### Configuration

📅 **Schedule**: Branch creation - "every weekend" (UTC), Automerge - At
any time (no schedule defined).

🚦 **Automerge**: Enabled.

♻ **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

---

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View the [repository job
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.github/workflows/cd.yml

@@ -39,7 +39,7 @@ jobs:
           path: dist
           merge-multiple: true
       - name: Generate artifact attestation for sdist and wheel(s)
-        uses: actions/attest-build-provenance@977bb373ede98d70efdf65b84cb5f73e068dcc2a # v3
+        uses: actions/attest-build-provenance@00014ed6ed5efc5b1ab7f7f34a39eb55d41aa4f8 # v3.1.0
         with:
           subject-path: "dist/*"
       - uses: pypa/gh-action-pypi-publish@ed0c53931b1dc9bd32cbe73a98c7f6766f8a527e # v1.13.0