Espressif BLE: uart_echo_client not working: regression from 9.0.5

[dhalbert]

Using main (after #9325):

Run ble_uart_echo_test.py on an nRF52840.
Run ble_uart_echo_client.py on a Metro ESP32-S3.

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "ble_uart_echo_client.py", line 36, in <module>
  File "adafruit_ble/__init__.py", line 316, in connect
_bleio.BluetoothError: Failed to connect: internal error

This works on 9.0.5. I am debugging this.