top: Update Python formatting to black "2023 stable style".

See https://black.readthedocs.io/en/stable/the_black_code_style/index.html

Signed-off-by: Jim Mussared <jim.mussared@gmail.com>

tests/extmod/uasyncio_exception.py

@@ -9,6 +9,7 @@ except ImportError:
         print("SKIP")
         raise SystemExit
 
+
 # main task raising an exception
 async def main():
     print("main start")
@@ -21,6 +22,7 @@ try:
 except ValueError as er:
     print("ValueError", er.args[0])
 
+
 # sub-task raising an exception
 async def task():
     print("task start")
@@ -40,6 +42,7 @@ try:
 except ValueError as er:
     print("ValueError", er.args[0])
 
+
 # main task raising an exception with sub-task not yet scheduled
 # TODO not currently working, task is never scheduled
 async def task():