update pull_requests.yml

Author: xiaozhu36

.github/workflows/pull_requests.yml

@@ -66,4 +66,4 @@ jobs:
             wget -q https://releases.hashicorp.com/terraform/1.6.0/terraform_1.6.0_linux_amd64.zip
             unzip terraform_1.6.0_linux_amd64.zip -d /usr/local/bin/
           fi
-          sh scripts/terraform-validate.sh ${CHANGED_FOLDERS}
+          bash scripts/terraform-validate.sh ${CHANGED_FOLDERS}