Use TypeAlias for type aliases where possible, part II (#7667)

stubs/PyYAML/yaml/__init__.pyi

@@ -1,5 +1,6 @@
 from collections.abc import Callable, Iterable, Iterator, Mapping, Sequence
 from typing import Any, Pattern, TypeVar, overload
+from typing_extensions import TypeAlias
 
 from . import resolver as resolver  # Help mypy a bit; this is implied by loader and dumper
 from .constructor import BaseConstructor
@@ -16,7 +17,7 @@ from .resolver import BaseResolver
 from .tokens import *
 
 # FIXME: the functions really return str if encoding is None, otherwise bytes. Waiting for python/mypy#5621
-_Yaml = Any
+_Yaml: TypeAlias = Any
 
 __with_libyaml__: Any
 __version__: str