fix: type provider (#744)

Author: philipbjorge

src/dependency_injector/providers.pyi

@@ -67,7 +67,7 @@ class Provider(Generic[T]):
     def unregister_overrides(self, provider: Union[Provider, Any]) -> None: ...
     def delegate(self) -> Provider: ...
     @property
-    def provider(self) -> Provider: ...
+    def provider(self) -> Provider[T]: ...
     @property
     def provided(self) -> ProvidedInstance[T]: ...
     def enable_async_mode(self) -> None: ...