module.json: Update to DAL release version 2.1.1. (#618)

Author: microbit-carlos

module.json

@@ -7,7 +7,7 @@
   "author": "Damien P George <[email protected]>",
   "homepage": "http://micropython.org",
   "dependencies":{
-    "microbit-dal":"lancaster-university/microbit-dal#v2.1.0"
+    "microbit-dal":"lancaster-university/microbit-dal#v2.1.1"
   },
   "extraIncludes":[
     "inc",