Fix YAML syntax error

SteeltoeInitializr.yaml

@@ -125,7 +125,7 @@ projectMetadata:
       - id: azure-spring-cloud
         name: Azure Spring Cloud
         description: Target Microsoft Azure Spring Cloud hosting.
-        dotNetFrameworkRange: [netcoreapp3.1,net5.0)
+        dotNetFrameworkRange: "[netcoreapp3.1,net5.0)"
         active: false
       - id: cloud-foundry
         name: Cloud Foundry