Remove unused imports

Author: tekktrik

circuitpython_typing/pwmio.py

@@ -13,10 +13,11 @@
 
 # # Protocol was introduced in Python 3.8.
 try:
-    from typing import Union, Tuple, Protocol
+    from typing import Protocol
 except ImportError:
     from typing_extensions import Protocol
 
+
 class PWMOut(Protocol):
     """Protocol that implements, at the bare minimum, the `duty_cycle` property"""