Update sigstore/cosign-installer action to v3.9.1

Author: renovate-rancher[bot]

.github/workflows/release.yml

@@ -80,7 +80,7 @@ jobs:
         uses: docker/setup-buildx-action@e468171a9de216ec08956ac3ada2f0791b6bd435 # v3
 
       - name: Install Cosign
-        uses: sigstore/cosign-installer@fb28c2b6339dcd94da6e4cbcbc5e888961f6f8c3 # v3.9.0
+        uses: sigstore/cosign-installer@398d4b0eeef1380460a10c8013a76f728fb906ac # v3.9.1
       - uses: rancherlabs/slsactl/actions/install-slsactl@43385ab2deb538998c480617f2939c5ddc7067ab # v0.0.14
 
       - name: "Read Vault Secrets"