Update deploy-bicep.yaml

Author: leegrash

.github/workflows/deploy-bicep.yaml

@@ -25,4 +25,4 @@ jobs:
           resourceGroupName: ${{ secrets.AZURE_RESOURCE_GROUP }}
           template: ./DemoEnvironment.bicep
           parameters: ./DemoEnvironment.parameters.json
-          mode: Complete
+          deplymentMode: Complete