build(deps): bump anchore/sbom-action from 0.15.6 to 0.15.8

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](c6aed38a43...b6a39da807)

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

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/artifacts.yaml

@@ -60,7 +60,7 @@ jobs:
         uses: docker/setup-buildx-action@f95db51fddba0c2d1ec667646a06c2ce06100226 # v3.0.0
 
       - name: Set up Syft
-        uses: anchore/sbom-action/download-syft@c6aed38a4323b393d05372c58a74c39ae8386d02 # v0.15.6
+        uses: anchore/sbom-action/download-syft@b6a39da80722a2cb0ef5d197531764a89b5d48c3 # v0.15.8
 
       - name: Install cosign
         uses: sigstore/cosign-installer@1fc5bd396d372bee37d608f955b336615edf79c8 # v3.2.0