Update cosign to v2.4.2 (#1303)

Change-Id: I5346ca655388a5c33463ccecc72657b539c83d76

Signed-off-by: Cosmin Cojocar <ccojocar@google.com>

Author: ccojocar

.github/workflows/release.yml

@@ -21,7 +21,7 @@ jobs:
       - name: Install Cosign
         uses: sigstore/cosign-installer@v3
         with:
-          cosign-release: 'v2.4.1'
+          cosign-release: 'v2.4.2'
       - name: Store Cosign private key in a file
         run: 'echo "$COSIGN_KEY" > /tmp/cosign.key'
         shell: bash