Bump anchore/sbom-action from 0.20.5 to 0.20.6 in /.github/actions/sbom

Bumps [anchore/sbom-action](https://github.com/anchore/sbom-action) from 0.20.5 to 0.20.6.
- [Release notes](https://github.com/anchore/sbom-action/releases)
- [Changelog](https://github.com/anchore/sbom-action/blob/main/RELEASE.md)
- [Commits](anchore/sbom-action@da167ea...f8bdd1d)

---
updated-dependencies:
- dependency-name: anchore/sbom-action
  dependency-version: 0.20.6
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

.github/actions/sbom/action.yml

@@ -16,7 +16,7 @@ runs:
   steps:
     - name: Setup Syft
       id: setup-syft
-      uses: anchore/sbom-action/download-syft@da167eac915b4e86f08b264dbdbc867b61be6f0c # v0
+      uses: anchore/sbom-action/download-syft@f8bdd1d8ac5e901a77a92f111440fdb1b593736b # v0
 
     - name: Generate SBOM
       id: generate-sbom