Handle cancelation in wait_for_ble_connections_free
If `wait_for_ble_connections_free` was canceled due to timeout or
the esp disconnecting from Home Assistant the future would get
canceled. When we reconnect and get the next callback we need
to handle it being done.
fixes
```
2023-03-21 02:34:36.876 ERROR (MainThread) [homeassistant] Error doing job: Fatal error: protocol.data_received() call failed.
Traceback (most recent call last):
File "/usr/local/lib/python3.10/asyncio/selector_events.py", line 868, in _read_ready__data_received
self._protocol.data_received(data)
File "/usr/local/lib/python3.10/site-packages/aioesphomeapi/_frame_helper.py", line 195, in data_received
self._callback_packet(msg_type_int, bytes(packet_data))
File "/usr/local/lib/python3.10/site-packages/aioesphomeapi/_frame_helper.py", line 110, in _callback_packet
self._on_pkt(Packet(type_, data))
File "/usr/local/lib/python3.10/site-packages/aioesphomeapi/connection.py", line 688, in _process_packet
handler(msg)
File "/usr/local/lib/python3.10/site-packages/aioesphomeapi/client.py", line 482, in on_msg
on_bluetooth_connections_free_update(resp.free, resp.limit)
File "/usr/src/homeassistant/homeassistant/components/esphome/entry_data.py", line 136, in async_update_ble_connection_limits
fut.set_result(free)
asyncio.exceptions.InvalidStateError: invalid state
```
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