Change cosign-install commit hash, bump release ver

Author: MrLutik

.github/workflows/main.yml

@@ -104,9 +104,11 @@ jobs:
       # Install the cosign tool
       # ref.: https://github.com/sigstore/cosign-installer, v3.0.1
       - name: Install cosign
-        uses: sigstore/cosign-installer@c3667d99424e7e6047999fb6246c0da843953c65
+        uses: sigstore/cosign-installer@1fc5bd396d372bee37d608f955b336615edf79c8
         with:
           cosign-release: 'v2.0.0'
+      - name: Confirm installation!
+        run: cosign version
       # Workaround: https://github.com/docker/build-push-action/issues/461
       # ref.: https://github.com/docker/setup-buildx-action, v2.5.0
       - name: Setup Docker buildx