build: run dependency check on pushes, for more action uniformity

Author: nedbat

.github/workflows/dependency-review.yml

@@ -4,8 +4,15 @@
 #
 # 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:
+  push:
+    branches:
+      - master
+      - nedbat/*
+  pull_request:
+  workflow_dispatch:
 
 permissions:
   contents: read
@@ -18,3 +25,6 @@ jobs:
         uses: actions/checkout@v3
       - name: 'Dependency Review'
         uses: actions/dependency-review-action@v3
+        with:
+          base-ref: ${{ github.event.pull_request.base.ref || 'master' }}
+          head-ref: ${{ github.event.pull_request.head.ref || github.ref }}