Fix AdminClient type annotation (#2244)

Author: RasmusNygren

src/confluent_kafka/admin/__init__.py

@@ -23,6 +23,7 @@
 
 import concurrent.futures
 import warnings
+from collections.abc import Mapping
 from typing import Any, Dict, List, Optional, Set, Tuple, Union
 
 from confluent_kafka import ConsumerGroupState as _ConsumerGroupState
@@ -115,7 +116,7 @@ class AdminClient(_AdminClientImpl):
     Requires broker version v0.11.0.0 or later.
     """
 
-    def __init__(self, conf: Dict[str, Union[str, int, float, bool]], **kwargs: Any) -> None:
+    def __init__(self, conf: Mapping[str, Union[str, int, float, bool]], **kwargs: Any) -> None:
         """
         Create a new AdminClient using the provided configuration dictionary.
 

src/confluent_kafka/cimpl.pyi

@@ -35,6 +35,7 @@ maintenance burden and get type hints directly from the implementation.
 """
 
 import builtins
+from collections.abc import Mapping
 from typing import Any, Callable, Dict, List, Literal, Optional, Tuple, Union, overload
 
 try:
@@ -540,7 +541,7 @@ class Consumer:
     def set_sasl_credentials(self, username: str, password: str) -> None: ...
 
 class _AdminClientImpl:
-    def __init__(self, config: Dict[str, Union[str, int, float, bool]]) -> None: ...
+    def __init__(self, config: Mapping[str, Union[str, int, float, bool]]) -> None: ...
     def __enter__(self) -> Self: ...
     def __exit__(self, exc_type: Any, exc_value: Any, exc_traceback: Any) -> Optional[bool]: ...
     def create_topics(