chore(deps): update sigstore/cosign-installer action to v4 (#690)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/release-publish.yml

@@ -66,7 +66,7 @@ jobs:
           password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Install sigstore/cosign
-        uses: sigstore/cosign-installer@d7543c93d881b35a8faa02e8e3605f69b7a1ce62 # v3.10.0
+        uses: sigstore/cosign-installer@faadad0cce49287aee09b3a48701e75088a2c6ad # v4.0.0
 
       - name: Push charts to GHCR
         env:

.github/workflows/tests-cluster-chainsaw.yaml

@@ -34,7 +34,7 @@ jobs:
           fetch-depth: 0
 
       - name: Install Cosign
-        uses: sigstore/cosign-installer@d7543c93d881b35a8faa02e8e3605f69b7a1ce62 # v3.10.0
+        uses: sigstore/cosign-installer@faadad0cce49287aee09b3a48701e75088a2c6ad # v4.0.0
 
       - name: Setup kind
         uses: ./.github/actions/setup-kind

.github/workflows/tests-plugin-barman-cloud.yaml

@@ -34,7 +34,7 @@ jobs:
           fetch-depth: 0
 
       - name: Install Cosign
-        uses: sigstore/cosign-installer@d7543c93d881b35a8faa02e8e3605f69b7a1ce62 # v3.10.0
+        uses: sigstore/cosign-installer@faadad0cce49287aee09b3a48701e75088a2c6ad # v4.0.0
 
       - name: Setup kind
         uses: ./.github/actions/setup-kind