robustify ci

Author: pavel-kirienko

tests/application/node_tracker.py

@@ -254,7 +254,7 @@ def validating_handler(node_id: int, old: typing.Optional[Entry], new: typing.Op
  n_a = make_node(NodeInfo(name="org.opencyphal.pycyphal.test.node_tracker.a"), transport=get_transport(0xA))
  n_a.heartbeat_publisher.vendor_specific_status_code = 0xFE
  n_a.start()
- await asyncio.sleep(9)
+ await asyncio.sleep(15)
  assert num_events_a == 4 # Two extra events: node restart detection, then get info reception.
  assert num_events_b == 3
  assert num_events_c == 2