Add mypy test fixes

Author: rmk135

tests/typing/configuration.py

@@ -1,12 +1,13 @@
 from pathlib import Path
+from typing import Any
 
 from dependency_injector import providers
 from pydantic import BaseSettings as PydanticSettings
 
 
 # Test 1: to check the getattr
-config1 = providers.Configuration()
-provider1 = providers.Factory(dict, a=config1.a)
+config1: providers.Provide[Any] = providers.Configuration()
+provider1: providers.Provider[dict] = providers.Factory(dict, a=config1.a)
 
 # Test 2: to check the from_*() method
 config2 = providers.Configuration()