Update fable-py

Author: dbrattli

.config/dotnet-tools.json

@@ -15,7 +15,7 @@
       ]
     },
     "fable-py": {
-      "version": "4.0.0-alpha-009",
+      "version": "4.0.0-alpha-012",
       "commands": [
         "fable-py"
       ]