Docs build broken

When I build the docs locally I first got a failure due to `_bleio` module not found.

I added that to the mock list which got me past that error.

But now the build is failing with this error:
```
WARNING: autodoc: failed to import module 'adafruit_ble_file_transfer'; the following exception was raised:
Traceback (most recent call last):
File ".cpy_venv/lib/python3.12/site-packages/sphinx/ext/autodoc/importer.py", line 143, in import_module
return importlib.import_module(modname)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/lib/python3.12/importlib/__init__.py", line 90, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "", line 1387, in _gcd_import
File "", line 1360, in _find_and_load
File "", line 1331, in _find_and_load_unlocked
File "", line 935, in _load_unlocked
File "", line 995, in exec_module
File "", line 488, in _call_with_frames_removed
File "Adafruit_CircuitPython_BLE_File_Transfer/adafruit_ble_file_transfer.py", line 76, in
class FileTransferService(Service):
File "Adafruit_CircuitPython_BLE_File_Transfer/adafruit_ble_file_transfer.py", line 86, in FileTransferService
raw = _TransferCharacteristic()
^^^^^^^^^^^^^^^^^^^^^^^^^
File "Adafruit_CircuitPython_BLE_File_Transfer/adafruit_ble_file_transfer.py", line 59, in __init__
properties=Characteristic.WRITE_NO_RESPONSE
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: unsupported operand type(s) for |: 'WRITE_NO_RESPONSE' and 'READ'
[autodoc.import_object]
```

Which appears to take issue with these lines: https://github.com/adafruit/Adafruit_CircuitPython_BLE_File_Transfer/blob/df30c3c42464bb961b3484a203352af4d6d64edd/adafruit_ble_file_transfer.py#L59-L61

`Characteristic.WRITE_NO_RESPONSE`, `Characteristic.READ` and `Characteristic.NOTIFY` are all ints if you follow them to their value, though they do go through some intermediary classes.

In a python 3.12 REPL I am able to bitwise OR the values wtihout issue:
```
Characteristic.NOTIFY | Characteristic.READ | Characteristic.WRITE_NO_RESPONSE
44
```
I'm not sure why sphinx / autodoc import is failing to do so.

Reproduziere den lokalen Dokumentations-Build mit Python 3.12 und untersuche den Sphinx-autodoc-Importfehler für adafruit_ble_file_transfer. Beginne mit den Zeilen 59–61 von adafruit_ble_file_transfer.py, insbesondere mit den Werten der Characteristic-Flags, und verfolge die im Bericht genannten Zwischenklassen. Als erledigt gilt die Aufgabe, wenn der Dokumentations-Build das Modul ohne diesen TypeError oder eine autodoc-Warnung importiert.

Vom Indexierungsmodell aus dem Issue-Text verfasst.