Update anchore/sbom-action action to v0.20.4 (#1096)

| datasource  | package             | from    | to      |
| ----------- | ------------------- | ------- | ------- |
| github-tags | anchore/sbom-action | v0.20.1 | v0.20.4 |

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/ci.yml

@@ -155,7 +155,7 @@ jobs:
         if: github.event_name != 'pull_request'
 
       - name: Download Syft
-        uses: anchore/sbom-action/download-syft@9246b90769f852b3a8921f330c59e0b3f439d6e9 # v0.20.1
+        uses: anchore/sbom-action/download-syft@7b36ad622f042cab6f59a75c2ac24ccb256e9b45 # v0.20.4
         if: github.ref_type == 'tag'
 
       - name: Install Cosign