Pin actions.

Author: chungyc

.github/workflows/dependency.yaml

@@ -6,5 +6,5 @@ jobs:
   dependency-review:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
-      - uses: actions/dependency-review-action@v3
+      - uses: actions/checkout@8f4b7f84864484a7bf31766abe9204da3cbe65b3 # v3.5.0
+      - uses: actions/dependency-review-action@f46c48ed6d4f1227fb2d9ea62bf6bcbed315589e # v3.0.4