Switch to PEP-604 syntax in python2 stubs (#5915)

Signed-off-by: oleg.hoefling <oleg.hoefling@gmail.com>

stdlib/@python2/sqlite3/dbapi2.pyi

@@ -1,5 +1,5 @@
 from datetime import date, datetime, time
-from typing import Any, Callable, Generator, Iterable, Iterator, List, Optional, Protocol, Text, Tuple, Type, TypeVar, Union
+from typing import Any, Callable, Generator, Iterable, Iterator, List, Protocol, Text, Tuple, Type, TypeVar
 
 _T = TypeVar("_T")
 
@@ -62,17 +62,17 @@ version: str
 def adapt(obj, protocol, alternate): ...
 def complete_statement(sql: str) -> bool: ...
 def connect(
-    database: Union[bytes, Text],
+    database: bytes | Text,
     timeout: float = ...,
     detect_types: int = ...,
-    isolation_level: Optional[str] = ...,
+    isolation_level: str | None = ...,
     check_same_thread: bool = ...,
-    factory: Optional[Type[Connection]] = ...,
+    factory: Type[Connection] | None = ...,
     cached_statements: int = ...,
 ) -> Connection: ...
 def enable_callback_tracebacks(__enable: bool) -> None: ...
 def enable_shared_cache(enable: int) -> None: ...
-def register_adapter(__type: Type[_T], __caster: Callable[[_T], Union[int, float, str, bytes]]) -> None: ...
+def register_adapter(__type: Type[_T], __caster: Callable[[_T], int | float | str | bytes]) -> None: ...
 def register_converter(__name: str, __converter: Callable[[bytes], Any]) -> None: ...
 
 class Cache(object):
@@ -106,11 +106,11 @@ class Connection(object):
     def create_aggregate(self, name: str, n_arg: int, aggregate_class: Callable[[], _AggregateProtocol]) -> None: ...
     def create_collation(self, __name: str, __callback: Any) -> None: ...
     def create_function(self, name: str, num_params: int, func: Any) -> None: ...
-    def cursor(self, cursorClass: Optional[type] = ...) -> Cursor: ...
+    def cursor(self, cursorClass: type | None = ...) -> Cursor: ...
     def execute(self, sql: str, parameters: Iterable[Any] = ...) -> Cursor: ...
     # TODO: please check in executemany() if seq_of_parameters type is possible like this
     def executemany(self, __sql: str, __parameters: Iterable[Iterable[Any]]) -> Cursor: ...
-    def executescript(self, __sql_script: Union[bytes, Text]) -> Cursor: ...
+    def executescript(self, __sql_script: bytes | Text) -> Cursor: ...
     def interrupt(self, *args: Any, **kwargs: Any) -> None: ...
     def iterdump(self, *args: Any, **kwargs: Any) -> Generator[str, None, None]: ...
     def rollback(self, *args: Any, **kwargs: Any) -> None: ...
@@ -127,7 +127,7 @@ class Connection(object):
     def load_extension(self, path: str) -> None: ...
     def __call__(self, *args: Any, **kwargs: Any) -> Any: ...
     def __enter__(self) -> Connection: ...
-    def __exit__(self, t: Optional[type], exc: Optional[BaseException], tb: Optional[Any]) -> None: ...
+    def __exit__(self, t: type | None, exc: BaseException | None, tb: Any | None) -> None: ...
 
 class Cursor(Iterator[Any]):
     arraysize: Any
@@ -143,9 +143,9 @@ class Cursor(Iterator[Any]):
     def close(self, *args: Any, **kwargs: Any) -> None: ...
     def execute(self, __sql: str, __parameters: Iterable[Any] = ...) -> Cursor: ...
     def executemany(self, __sql: str, __seq_of_parameters: Iterable[Iterable[Any]]) -> Cursor: ...
-    def executescript(self, __sql_script: Union[bytes, Text]) -> Cursor: ...
+    def executescript(self, __sql_script: bytes | Text) -> Cursor: ...
     def fetchall(self) -> List[Any]: ...
-    def fetchmany(self, size: Optional[int] = ...) -> List[Any]: ...
+    def fetchmany(self, size: int | None = ...) -> List[Any]: ...
     def fetchone(self) -> Any: ...
     def setinputsizes(self, *args: Any, **kwargs: Any) -> None: ...
     def setoutputsize(self, *args: Any, **kwargs: Any) -> None: ...