Merge pull request #323 from jetstack/dependabot/github_actions/sigstore/cosign-installer-2.3.0

Bump sigstore/cosign-installer from 2.1.0 to 2.3.0

Author: davidsbond

.github/workflows/release-master.yml

@@ -50,7 +50,7 @@ jobs:
       # See issue https://github.com/actions/checkout/issues/760
       run: git config --global --add safe.directory $GITHUB_WORKSPACE
     - name: Install cosign
-      uses: sigstore/cosign-installer@581838fbedd492d2350a9ecd427a95d6de1e5d01
+      uses: sigstore/cosign-installer@536b37ec5d5b543420bdfd9b744c5965bd4d8730
       with:
         cosign-release: v1.5.2
     - name: Install Syft