Modernize orjson stub (#5870)

* Use | instead of Union and Optional
* Import Callable from collections.abc, not typing
* Set version in METADATA
* Remove redundant "bytearray" from argument type
* Add obsolete_since metadata field

stubs/orjson/METADATA.toml

@@ -1 +1,2 @@
-version = "0.1"
+version = "3.6"
+obsolete_since = "3.6.1"

stubs/orjson/orjson.pyi

@@ -1,9 +1,10 @@
-from typing import Any, Callable, Optional, Union
+from collections.abc import Callable
+from typing import Any
 
 __version__: str
 
-def dumps(__obj: Any, default: Optional[Callable[[Any], Any]] = ..., option: Optional[int] = ...) -> bytes: ...
-def loads(__obj: Union[bytes, bytearray, str]) -> Any: ...
+def dumps(__obj: Any, default: Callable[[Any], Any] | None = ..., option: int | None = ...) -> bytes: ...
+def loads(__obj: bytes | str) -> Any: ...
 
 class JSONDecodeError(ValueError): ...
 class JSONEncodeError(TypeError): ...