fix cosign version (#8668)

Author: vepatel

.github/workflows/release.yml

@@ -574,6 +574,8 @@ jobs:
 
       - name: Install Cosign
         uses: sigstore/cosign-installer@faadad0cce49287aee09b3a48701e75088a2c6ad # v4.0.0
+        with:
+          cosign-release: 'v2.6.0'
 
       - name: Create Tarballs
         run: |