Bump anchore/sbom-action from 0.15.5 to 0.15.6 (#1513)

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -123,7 +123,7 @@ jobs:
         if: ${{ github.event_name == 'push' && github.ref != 'refs/heads/main' }}
 
       - name: Download Syft
-        uses: anchore/sbom-action/download-syft@24b0d5238516480139aa8bc6f92eeb7b54a9eb0a # v0.15.5
+        uses: anchore/sbom-action/download-syft@c6aed38a4323b393d05372c58a74c39ae8386d02 # v0.15.6
         if: github.ref_type == 'tag'
 
       - name: Install Cosign