chore: reintroduce tf locking

Author: jgravois

.github/workflows/terraform-plan.yml

@@ -43,4 +43,4 @@ jobs:
           TF_VAR_CONTAINER_TAG: ${{ github.sha }}
           TF_VAR_DEVSECOPS_OBJECT_ID: ${{ secrets.TF_VAR_DEVSECOPS_OBJECT_ID }}
           TF_VAR_ENGINEERING_GROUP_OBJECT_ID: ${{ secrets.TF_VAR_ENGINEERING_GROUP_OBJECT_ID }}
-        run: terraform plan -lock=false
+        run: terraform plan