Bump anchore/sbom-action from 0.15.6 to 0.15.8 (#624)

Bumps [anchore/sbom-action](https://github.com/anchore/sbom-action) from 0.15.6 to 0.15.8.
- [Release notes](https://github.com/anchore/sbom-action/releases)
- [Commits](anchore/sbom-action@c6aed38...b6a39da)

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

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

.github/workflows/ci.yml

@@ -150,7 +150,7 @@ jobs:
         if: github.event_name != 'pull_request'
 
       - name: Download Syft
-        uses: anchore/sbom-action/download-syft@c6aed38a4323b393d05372c58a74c39ae8386d02 # v0.15.6
+        uses: anchore/sbom-action/download-syft@b6a39da80722a2cb0ef5d197531764a89b5d48c3 # v0.15.8
         if: github.ref_type == 'tag'
 
       - name: Install Cosign