generate_board_targets_json.py: exclude uavcanv1 for now

px4_fmu-v4_uavcanv1 fails to build:
../../src/drivers/uavcan_v1/Uavcan.cpp: In static member function 'static int UavcanNode::start(uint32_t, uint32_t)':
../../src/drivers/uavcan_v1/Uavcan.cpp:140:29: error: 'interface' was not declared in this scope
  140 |  _instance = new UavcanNode(interface, node_id);

Tools/generate_board_targets_json.py

@@ -22,7 +22,11 @@ verbose = args.verbose
 build_configs = []
 excluded_manufacturers = ['atlflight']
 excluded_platforms = ['qurt']
-excluded_labels = ['stackcheck', 'nolockstep', 'replay', 'test']
+excluded_labels = [
+    'stackcheck',
+    'nolockstep', 'replay', 'test',
+    'uavcanv1' # TODO: fix and enable
+    ]
 
 def process_target(cmake_file, target_name):
     ret = None