codal_app: Update codal-microbit-v2 to v0.2.48.

Changes to codal-core:
- add support for dynamic pins on peripherals
- add function to generate dynamic runtime component IDs
- add sample rate support to the stream classes
- ensure AnimatedDisplay::waitForFreeDisplay() is free of race conditions

Changes to codal-microbit-v2:
- add SET_SOFTDEVICE_PRESENT option
- use DEVICE_BLE in codal.json to enable/disable BLE
- improve temporal response of SoundOutputPin::setAnalogValue()
- introduce convenience functions for playing SoundExpressions
- Introduce egress double buffering onto SoundEmojiSynth
- introduce audio output isplaying()

Charges to codal-nrf52:
- add support for dynamic pins on peripherals
- add sample rate support to the ADC

Signed-off-by: Damien George <damien@micropython.org>

Author: dpgeorge

src/codal_app/codal.json

@@ -2,7 +2,7 @@
     "target": {
         "name": "codal-microbit-v2",
         "url": "https://github.com/lancaster-university/codal-microbit-v2",
-        "branch": "v0.2.43",
+        "branch": "v0.2.48",
         "type": "git",
         "test_ignore": true
     } ,