fix(max86150): avoid stack overflow in pycardium by using smaller buf

pycardium/modules/max86150.c

@@ -28,7 +28,9 @@ STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(
 
 STATIC mp_obj_t mp_max86150_read_sensor(mp_obj_t stream_id_in)
 {
-	struct max86150_sensor_data buf[256];
+	// do not use too big buf
+	// 256*12 is close to stack size of 4096, reduced to 64
+	struct max86150_sensor_data buf[64];
 	int stream_id = mp_obj_get_int(stream_id_in);
 
 	int n = epic_stream_read(stream_id, buf, sizeof(buf));