⬆️👨‍💻 Update actions/attest-build-provenance action to v2 (#777)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
|
[actions/attest-build-provenance](https://redirect.github.com/actions/attest-build-provenance)
| action | major | `v1` -> `v2` |

---

### Release Notes

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

###
[`v2`](https://redirect.github.com/actions/attest-build-provenance/compare/v1...v2)

[Compare
Source](https://redirect.github.com/actions/attest-build-provenance/compare/v1...v2)

</details>

---

### Configuration

📅 **Schedule**: Branch creation - "every weekend" (UTC), 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/cd.yml

@@ -59,7 +59,7 @@ jobs:
           path: dist
           merge-multiple: true
       - name: Generate artifact attestation for sdist and wheel(s)
-        uses: actions/attest-build-provenance@v1
+        uses: actions/attest-build-provenance@v2
         with:
           subject-path: "dist/*"
       - uses: pypa/gh-action-pypi-publish@release/v1