Update sigstore/cosign-installer digest to b235ed9

Author: renovate[bot]

Diff for: .github/workflows/docker-publish.yml

@@ -41,7 +41,7 @@ jobs:
       # https://github.com/sigstore/cosign-installer
       - name: Install cosign
         if: github.event_name != 'pull_request'
-        uses: sigstore/cosign-installer@b49ef6b125b98c2708965eeb167d89e86aa73ef6
+        uses: sigstore/cosign-installer@b235ed95bef2a3cf9f8641bc537bc22c7cb9a3a8
         with:
           cosign-release: 'v1.9.0'