mysqlclient.connection: add missing type hints (#8393)

Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>

stubs/mysqlclient/MySQLdb/connections.pyi

@@ -1,7 +1,8 @@
 from _typeshed import Self
+from types import TracebackType
 from typing import Any
 
-from . import _mysql, cursors as cursors
+from . import _mysql, cursors
 from ._exceptions import (
     DatabaseError as DatabaseError,
     DataError as DataError,
@@ -20,16 +21,18 @@ re_numeric_part: Any
 def numeric_part(s): ...
 
 class Connection(_mysql.connection):
-    default_cursor: Any
-    cursorclass: Any
+    default_cursor: type[cursors.Cursor]
+    cursorclass: type[cursors.BaseCursor]
     encoders: Any
     encoding: str
     messages: Any
-    def __init__(self, *args, **kwargs): ...
+    def __init__(self, *args, **kwargs) -> None: ...
     def __enter__(self: Self) -> Self: ...
-    def __exit__(self, exc_type, exc_value, traceback) -> None: ...
-    def autocommit(self, on) -> None: ...
-    def cursor(self, cursorclass: Any | None = ...): ...
+    def __exit__(
+        self, exc_type: type[BaseException] | None, exc_value: BaseException | None, traceback: TracebackType | None
+    ) -> None: ...
+    def autocommit(self, on: bool) -> None: ...
+    def cursor(self, cursorclass: type[cursors.BaseCursor] | None = ...): ...
     def query(self, query) -> None: ...
     def literal(self, o): ...
     def begin(self) -> None: ...