Update sigstore/community digest to 821f804

Author: renovate[bot]

.github/workflows/depsreview.yml

@@ -21,4 +21,4 @@ permissions:
 jobs:
   dependency-review:
     name: License and Vulnerability Scan
-    uses: sigstore/community/.github/workflows/reusable-dependency-review.yml@55b19bf31b07f74c544dab4c77c33b03f2182e0a
+    uses: sigstore/community/.github/workflows/reusable-dependency-review.yml@821f804d8c5432b2914c07fee56053dbba91e3a8