chore(deps): update anchore/sbom-action action to v0.15.6

Author: renovate[bot]

.github/workflows/release.yml

@@ -25,7 +25,7 @@ jobs:
       - name: Install Cosign
         uses: sigstore/cosign-installer@v3
       - name: Install Syft
-        uses: anchore/sbom-action/download-syft@v0.15.1
+        uses: anchore/sbom-action/download-syft@v0.15.6
       - name: Run GoReleaser
         id: release-pipeline
         uses: goreleaser/goreleaser-action@v5