Use embedded version of microbit to avoid yotta build

libs/lang-test0/pxt.json

@@ -8,6 +8,6 @@
     "public": true,
     "additionalFilePath": "../../node_modules/pxt-core/libs/lang-test0",
     "dependencies": {
-        "microbit": "file:../microbit"
+        "microbit": "*"
     }
 }

libs/lang-test1/pxt.json

@@ -7,6 +7,6 @@
     ],
     "public": true,
     "dependencies": {
-        "microbit": "file:../microbit"
+        "microbit": "*"
     }
 }