Hash pin actions

Author: ldionne

.github/workflows/deploy-lnt.llvm.org.yaml

@@ -18,10 +18,10 @@ jobs:
     - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8
 
     - name: Setup Terraform
-      uses: hashicorp/setup-terraform@v3
+      uses: hashicorp/setup-terraform@b9cd54a3c349d3f38e8881555d616ced269862dd # v3.1.2
 
     - name: Configure AWS Credentials
-      uses: aws-actions/configure-aws-credentials@v4
+      uses: aws-actions/configure-aws-credentials@00943011d9042930efac3dcd3a170e4273319bc8 # v5.1.0
       with:
         aws-access-key-id: ${{ secrets.AWS_ACCESS_KEY_ID }}
         aws-secret-access-key: ${{ secrets.AWS_SECRET_ACCESS_KEY }}