[CI] Use latest cosign

Author: karuboniru

.github/workflows/docker-publish.yml

@@ -41,9 +41,7 @@ jobs:
       # https://github.com/sigstore/cosign-installer
       - name: Install cosign
         if: github.event_name != 'pull_request'
-        uses: sigstore/cosign-installer@6e04d228eb30da1757ee4e1dd75a0ec73a653e06 #v3.1.1
-        with:
-          cosign-release: 'v2.1.1'
+        uses: sigstore/[email protected]
 
       # Set up QEMU for cross-platform builds
       - name: Set up QEMU