Use TypeAlias where possible for type aliases (#7630)

stubs/simplejson/simplejson/__init__.pyi

@@ -1,11 +1,12 @@
 from typing import IO, Any, Text
+from typing_extensions import TypeAlias
 
 from simplejson.decoder import JSONDecoder as JSONDecoder
 from simplejson.encoder import JSONEncoder as JSONEncoder, JSONEncoderForHTML as JSONEncoderForHTML
 from simplejson.raw_json import RawJSON as RawJSON
 from simplejson.scanner import JSONDecodeError as JSONDecodeError
 
-_LoadsString = Text | bytes | bytearray
+_LoadsString: TypeAlias = Text | bytes | bytearray
 
 def dumps(obj: Any, *args: Any, **kwds: Any) -> str: ...
 def dump(obj: Any, fp: IO[str], *args: Any, **kwds: Any) -> None: ...