fix min prefix length from 3 to 2 (#56)

Author: jtracey93

src/ALZ/Assets/alz-bicep-config/v0.14.0.config.json

@@ -159,7 +159,7 @@
             ],
             "Value": "",
             "DefaultValue": "alz",
-            "Valid": "^[a-zA-Z]{3,5}$"
+            "Valid": "^[a-zA-Z]{2,5}$"
         },
         "Location": {
             "Type": "UserInput",
@@ -523,4 +523,4 @@
             ]
         }
     }
-}
+}