Use new union syntax in rest of stdlib (#5884)

stdlib/email/_header_value_parser.pyi

@@ -1,7 +1,7 @@
 import sys
 from email.errors import HeaderParseError, MessageDefect
 from email.policy import Policy
-from typing import Any, Iterable, Iterator, List, Optional, Pattern, Set, Tuple, Type, TypeVar, Union
+from typing import Any, Iterable, Iterator, List, Pattern, Set, Tuple, Type, TypeVar, Union
 from typing_extensions import Final
 
 _T = TypeVar("_T")
@@ -24,7 +24,7 @@ if sys.version_info >= (3, 7):
     rfc2047_matcher: Pattern[str]
 
 class TokenList(List[Union[TokenList, Terminal]]):
-    token_type: Optional[str] = ...
+    token_type: str | None = ...
     syntactic_break: bool = ...
     ew_combine_allowed: bool = ...
     defects: List[MessageDefect] = ...
@@ -69,9 +69,9 @@ class Token(TokenList):
 
 class EncodedWord(TokenList):
     token_type: str = ...
-    cte: Optional[str] = ...
-    charset: Optional[str] = ...
-    lang: Optional[str] = ...
+    cte: str | None = ...
+    charset: str | None = ...
+    lang: str | None = ...
 
 class QuotedString(TokenList):
     token_type: str = ...
@@ -145,7 +145,7 @@ class NameAddr(TokenList):
     @property
     def domain(self) -> str: ...
     @property
-    def route(self) -> Optional[List[Domain]]: ...
+    def route(self) -> List[Domain] | None: ...
     @property
     def addr_spec(self) -> str: ...
 
@@ -156,7 +156,7 @@ class AngleAddr(TokenList):
     @property
     def domain(self) -> str: ...
     @property
-    def route(self) -> Optional[List[Domain]]: ...
+    def route(self) -> List[Domain] | None: ...
     @property
     def addr_spec(self) -> str: ...
 
@@ -247,8 +247,8 @@ class DomainLiteral(TokenList):
 
 class MIMEVersion(TokenList):
     token_type: str = ...
-    major: Optional[int] = ...
-    minor: Optional[int] = ...
+    major: int | None = ...
+    minor: int | None = ...
 
 class Parameter(TokenList):
     token_type: str = ...
@@ -270,7 +270,7 @@ class Attribute(TokenList):
 
 class Section(TokenList):
     token_type: str = ...
-    number: Optional[int] = ...
+    number: int | None = ...
 
 class Value(TokenList):
     token_type: str = ...