Use PEP 604 syntax wherever possible (#7493)

stubs/python-dateutil/dateutil/parser/__init__.pyi

@@ -1,9 +1,9 @@
 from datetime import datetime, tzinfo
-from typing import IO, Any, Mapping, Text, Union
+from typing import IO, Any, Mapping, Text
 
 from .isoparser import isoparse as isoparse, isoparser as isoparser
 
-_FileOrStr = Union[bytes, Text, IO[str], IO[Any]]
+_FileOrStr = bytes | Text | IO[str] | IO[Any]
 
 class parserinfo(object):
     JUMP: list[str]

stubs/python-dateutil/dateutil/parser/isoparser.pyi

@@ -1,9 +1,9 @@
 from _typeshed import SupportsRead
 from datetime import date, datetime, time, tzinfo
-from typing import Text, Union
+from typing import Text
 
-_Readable = SupportsRead[Union[Text, bytes]]
-_TakesAscii = Union[Text, bytes, _Readable]
+_Readable = SupportsRead[Text | bytes]
+_TakesAscii = Text | bytes | _Readable
 
 class isoparser:
     def __init__(self, sep: Text | bytes | None = ...): ...

stubs/python-dateutil/dateutil/tz/tz.pyi

@@ -1,10 +1,10 @@
 import datetime
-from typing import IO, Any, Text, TypeVar, Union
+from typing import IO, Any, Text, TypeVar
 
 from ..relativedelta import relativedelta
 from ._common import _tzinfo as _tzinfo, enfold as enfold, tzname_in_python2 as tzname_in_python2, tzrangebase as tzrangebase
 
-_FileObj = Union[str, Text, IO[str], IO[Text]]
+_FileObj = str | Text | IO[str] | IO[Text]
 _DT = TypeVar("_DT", bound=datetime.datetime)
 
 ZERO: datetime.timedelta