Use PEP 604 syntax wherever possible (#7493)

stdlib/xml/dom/pulldom.pyi

@@ -1,6 +1,6 @@
 import sys
 from _typeshed import SupportsRead
-from typing import Any, Sequence, Union
+from typing import Any, Sequence
 from typing_extensions import Literal
 from xml.dom.minidom import Document, DOMImplementation, Element, Text
 from xml.sax.handler import ContentHandler
@@ -15,8 +15,8 @@ PROCESSING_INSTRUCTION: Literal["PROCESSING_INSTRUCTION"]
 IGNORABLE_WHITESPACE: Literal["IGNORABLE_WHITESPACE"]
 CHARACTERS: Literal["CHARACTERS"]
 
-_DocumentFactory = Union[DOMImplementation, None]
-_Node = Union[Document, Element, Text]
+_DocumentFactory = DOMImplementation | None
+_Node = Document | Element | Text
 
 _Event = tuple[
     Literal[

stdlib/xml/dom/xmlbuilder.pyi

@@ -1,4 +1,4 @@
-from typing import Any, NoReturn, Optional
+from typing import Any, NoReturn
 from typing_extensions import Literal
 from urllib.request import OpenerDirector
 from xml.dom.expatbuilder import ExpatBuilder, ExpatBuilderNS
@@ -18,13 +18,13 @@ __all__ = ["DOMBuilder", "DOMEntityResolver", "DOMInputSource"]
 
 # probably the same as `Options.errorHandler`?
 # Maybe `xml.sax.handler.ErrorHandler`?
-_DOMBuilderErrorHandlerType = Optional[Any]
+_DOMBuilderErrorHandlerType = Any | None
 # probably some kind of IO...
-_DOMInputSourceCharacterStreamType = Optional[Any]
+_DOMInputSourceCharacterStreamType = Any | None
 # probably a string??
-_DOMInputSourceStringDataType = Optional[Any]
+_DOMInputSourceStringDataType = Any | None
 # probably a string??
-_DOMInputSourceEncodingType = Optional[Any]
+_DOMInputSourceEncodingType = Any | None
 
 class Options:
     namespaces: int

stdlib/xml/etree/ElementTree.pyi

@@ -12,7 +12,6 @@ from typing import (
     MutableSequence,
     Sequence,
     TypeVar,
-    Union,
     overload,
 )
 from typing_extensions import Literal, SupportsIndex, TypeGuard
@@ -102,9 +101,9 @@ else:
     ]
 
 _T = TypeVar("_T")
-_FileRead = Union[StrOrBytesPath, FileDescriptor, SupportsRead[bytes], SupportsRead[str]]
-_FileWriteC14N = Union[StrOrBytesPath, FileDescriptor, SupportsWrite[bytes]]
-_FileWrite = Union[_FileWriteC14N, SupportsWrite[str]]
+_FileRead = StrOrBytesPath | FileDescriptor | SupportsRead[bytes] | SupportsRead[str]
+_FileWriteC14N = StrOrBytesPath | FileDescriptor | SupportsWrite[bytes]
+_FileWrite = _FileWriteC14N | SupportsWrite[str]
 
 VERSION: str