Restore python pre-3.9 compatibility

.. and anyway the type is actually a Tuple when using usb_hid.devices
in CircuitPython.

This has a small cost in mpy file size but not as much as we earned back
with earlier optimizations. The over-broad exception is used in order
to reduce byte code growth

Author: jepler

adafruit_hid/keyboard.py

@@ -17,6 +17,10 @@
 
 from . import find_device
 
+try:
+    from typing import Sequence
+except:  # pylint: disable=bare-except
+    pass
 
 _MAX_KEYPRESSES = const(6)
 
@@ -35,7 +39,7 @@ class Keyboard:
 
     # No more than _MAX_KEYPRESSES regular keys may be pressed at once.
 
-    def __init__(self, devices: list[usb_hid.Device]) -> None:
+    def __init__(self, devices: Sequence[usb_hid.Device]) -> None:
         """Create a Keyboard object that will send keyboard HID reports.
 
         Devices can be a sequence of devices that includes a keyboard device or a keyboard device