fix: apply to dependency review

.github/workflows/dependency-review.yml

@@ -5,7 +5,10 @@
 # Source repository: https://github.com/actions/dependency-review-action
 # Public documentation: https://docs.github.com/en/code-security/supply-chain-security/understanding-your-software-supply-chain/about-dependency-review#dependency-review-enforcement
 name: 'Dependency Review'
-on: [pull_request]
+on:
+  pull_request:
+    branches:
+      - main
 
 permissions:
   contents: read