Add type annotation to Config kwargs in workers.py

https://mypy.readthedocs.io/en/stable/type_inference_and_annotations.html

This is just one of those times when mypy needs a little help.

Author: br3ndonland

uvicorn/workers.py

@@ -30,7 +30,7 @@ def __init__(self, *args: Any, **kwargs: Any) -> None:
         logger.setLevel(self.log.access_log.level)
         logger.propagate = False
 
-        config_kwargs = {
+        config_kwargs: dict = {
             "app": None,
             "log_config": None,
             "timeout_keep_alive": self.cfg.keepalive,