yotta: Explicitly point to master branch for dependencies

In the absence of the explicit branch/revision, yotta will automatically
go for the latest tagged version, which would not necessarily be up to
date.

Signed-off-by: Raphael Gault <raphael.gault@arm.com>

module.json

@@ -4,7 +4,7 @@
   "description": "Component Oriented Device Abstraction Layer (CODAL) - root",
   "license": "MIT",
   "dependencies": {
-    "codal-microbit": "git@github.com:microbit-foundation/codal-microbit.git"
+    "codal-microbit": "git@github.com:microbit-foundation/codal-microbit.git#master"
   },
   "targetDependencies": {},
   "extraIncludes": [