Update .github/workflows/release.yml

Co-authored-by: José Guilherme Vanz <1514798+jvanz@users.noreply.github.com>
Signed-off-by: Flavio Castelli <flavio@castelli.me>

Author: flavio

.github/workflows/release.yml

@@ -59,8 +59,6 @@ jobs:
           cosign sign-blob --yes --output-certificate policy-server-sbom.spdx.cert \
             --output-signature policy-server-sbom.spdx.sig \
             policy-server-sbom.spdx
-        env:
-          COSIGN_EXPERIMENTAL: 1
 
       - name: Get latest release tag
         id: get_last_release_tag