added missing type annotations

Author: attwad

pythonosc/udp_client.py

@@ -58,7 +58,7 @@ def __init__(
     def __enter__(self) -> "UDPClient":
         return self
 
-    def __exit__(self, exc_type, exc_val, exc_tb) -> None:
+    def __exit__(self, exc_type: type | None, exc_val: Exception | None, exc_tb: object | None) -> None:
         self.close()
 
     def close(self) -> None: