More packaging fixes

Author: microbit-matt-hillsdon

lib/flashing/flashing-makecode.ts

@@ -1,5 +1,5 @@
 import MemoryMap from "nrf-intel-hex";
-import { RegionInfo } from "../partial-flashing-service";
+import { RegionInfo } from "../partial-flashing-service.js";
 
 const PXT_MAGIC_HEX = "708E3B92C615A841C49866C975EE5197";
 

lib/flashing/nordic-dfu.ts

@@ -8,7 +8,7 @@ import {
   DeviceError,
   ProgressCallback,
   ProgressStage,
-} from "../device";
+} from "../device.js";
 
 const appBinFilename = "application.bin";
 const appDatFilename = "application.dat";