chore: remove artifact attestation step from CI check workflow

Author: rossarmstrong

.github/workflows/ci-check.yml

@@ -129,10 +129,5 @@ jobs:
           path: .
           merge-multiple: true
 
-      - name: Generate artifact attestation
-        uses: actions/attest-build-provenance@v2
-        with:
-          subject-path: '{wheels-*/*,sdist-artifact/*}'
-
       - name: List distributions
         run: ls -lh .