Bump the actions group with 1 update

Bumps the actions group with 1 update: [anchore/sbom-action](https://github.com/anchore/sbom-action).


Updates `anchore/sbom-action` from 0.15.5 to 0.15.6
- [Release notes](https://github.com/anchore/sbom-action/releases)
- [Commits](anchore/sbom-action@24b0d52...c6aed38)

---
updated-dependencies:
- dependency-name: anchore/sbom-action
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: actions
...

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/ci.yml

@@ -177,7 +177,7 @@ jobs:
         if: ${{ needs.checks.outputs.binary_cache_hit != 'true' }}
 
       - 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