Use branch.

Author: jonsimantov

cmake/external/firestore.cmake

@@ -21,7 +21,7 @@ endif()
 # If the format of the line below changes, then be sure to update
 # https://github.com/firebase/firebase-cpp-sdk/blob/fd054fa016/.github/workflows/update-dependencies.yml#L81
 #set(version CocoaPods-11.8.1)
-set(version firestore-core-android-build-fix)
+set(version dconeybe/AndroidAbslExceptionsFix)
 
 function(GetReleasedDep)
   message("Getting released firebase-ios-sdk @ ${version}")