Update actions/attest-build-provenance action to v4

Author: renovate[bot]

.github/workflows/python.yml

@@ -312,7 +312,7 @@ jobs:
     steps:
       - uses: actions/download-artifact@v8
       - name: Generate artifact attestation
-        uses: actions/attest-build-provenance@v3
+        uses: actions/attest-build-provenance@v4
         with:
           subject-path: 'wheels-*/*'
       - name: Publish to PyPI