Let dependency-review write to repository graph

Not sure how this ever worked, it needs write access to the github API
so it can update the dependencies.

Author: afranken

.github/workflows/dependency-review.yml

@@ -10,7 +10,7 @@ name: 'Dependency Review'
 on: [pull_request]
 
 permissions:
-  contents: read
+  contents: write
 
 concurrency:
   group: dependency-review-${{ github.ref }}