Update dflook/terraform-validate digest to 4a73778 (#410)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

.github/workflows/terraform.yaml

@@ -17,7 +17,7 @@ jobs:
     - name: Checkout code
       uses: actions/checkout@cbb722410c2e876e24abbe8de2cc27693e501dcb
     - name: Validate Terraform
-      uses: dflook/terraform-validate@46e4736fe16f84ba22a09c6c4d4a7bd5bb5f978e
+      uses: dflook/terraform-validate@4a73778c8a9a037688cb8518dfb766f8a77fae72
       with:
         path: terraform/environment/wildsea