Added some missing parameter annotations and type arguments detected by pyright. (#5061)

Co-authored-by: Eric Traut <erictr@microsoft.com>

stubs/retry/retry/api.pyi

@@ -25,4 +25,4 @@ def retry(
     backoff: float = ...,
     jitter: Union[Tuple[float, float], float] = ...,
     logger: Optional[Logger] = ...,
-) -> _Decorator: ...
+) -> _Decorator[_T]: ...