fix(release-notes): Fix release outputs (#2087)

Signed-off-by: Javier Rodriguez <[email protected]>

Author: javirln

.github/workflows/release.yaml

@@ -186,7 +186,7 @@ jobs:
     env:
       CHAINLOOP_TOKEN: ${{ secrets.CHAINLOOP_TOKEN }}
     outputs:
-      attestation_hash: ${{ steps.attestation_push.attestation_sha }}
+      attestation_hash: ${{ steps.attestation_push.outputs.attestation_sha }}
     steps:
       - name: Install Chainloop
         run: |