chore(deps): update actions/attest-build-provenance action to v4 (#10)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/CI.yml

@@ -205,7 +205,7 @@ jobs:
     steps:
       - uses: actions/download-artifact@v6
       - name: Generate artifact attestation
-        uses: actions/attest-build-provenance@v3
+        uses: actions/attest-build-provenance@v4
         with:
           subject-path: "wheels-*/*"
       - name: Install uv