ci(.goreleaser.yaml): update cosign v3 required arg

Signed-off-by: Massimiliano Giovagnoli <[email protected]>

Author: maxgio92

.goreleaser.yaml

@@ -38,6 +38,7 @@ signs:
     certificate: '${artifact}.pem'
     args:
       - sign-blob
+      - '--bundle=${artifact}.sigstore'
       - '--output-certificate=${certificate}'
       - '--output-signature=${signature}'
       - '${artifact}'