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

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

stdlib/@python2/threading.pyi

@@ -1,5 +1,5 @@
 from types import FrameType, TracebackType
-from typing import Any, Callable, Iterable, List, Mapping, Optional, Text, Type, TypeVar, Union
+from typing import Any, Callable, Iterable, List, Mapping, Optional, Text, Type, TypeVar
 
 # TODO recursive type
 _TF = Callable[[FrameType, str, Any], Optional[Callable[..., Any]]]
@@ -15,7 +15,7 @@ def current_thread() -> Thread: ...
 def currentThread() -> Thread: ...
 def enumerate() -> List[Thread]: ...
 def settrace(func: _TF) -> None: ...
-def setprofile(func: Optional[_PF]) -> None: ...
+def setprofile(func: _PF | None) -> None: ...
 def stack_size(size: int = ...) -> int: ...
 
 class ThreadError(Exception): ...
@@ -27,19 +27,19 @@ class local(object):
 
 class Thread:
     name: str
-    ident: Optional[int]
+    ident: int | None
     daemon: bool
     def __init__(
         self,
         group: None = ...,
-        target: Optional[Callable[..., Any]] = ...,
-        name: Optional[Text] = ...,
+        target: Callable[..., Any] | None = ...,
+        name: Text | None = ...,
         args: Iterable[Any] = ...,
-        kwargs: Optional[Mapping[Text, Any]] = ...,
+        kwargs: Mapping[Text, Any] | None = ...,
     ) -> None: ...
     def start(self) -> None: ...
     def run(self) -> None: ...
-    def join(self, timeout: Optional[float] = ...) -> None: ...
+    def join(self, timeout: float | None = ...) -> None: ...
     def getName(self) -> str: ...
     def setName(self, name: Text) -> None: ...
     def is_alive(self) -> bool: ...
@@ -53,8 +53,8 @@ class Lock:
     def __init__(self) -> None: ...
     def __enter__(self) -> bool: ...
     def __exit__(
-        self, exc_type: Optional[Type[BaseException]], exc_val: Optional[BaseException], exc_tb: Optional[TracebackType]
-    ) -> Optional[bool]: ...
+        self, exc_type: Type[BaseException] | None, exc_val: BaseException | None, exc_tb: TracebackType | None
+    ) -> bool | None: ...
     def acquire(self, blocking: bool = ...) -> bool: ...
     def release(self) -> None: ...
     def locked(self) -> bool: ...
@@ -63,22 +63,22 @@ class _RLock:
     def __init__(self) -> None: ...
     def __enter__(self) -> bool: ...
     def __exit__(
-        self, exc_type: Optional[Type[BaseException]], exc_val: Optional[BaseException], exc_tb: Optional[TracebackType]
-    ) -> Optional[bool]: ...
+        self, exc_type: Type[BaseException] | None, exc_val: BaseException | None, exc_tb: TracebackType | None
+    ) -> bool | None: ...
     def acquire(self, blocking: bool = ...) -> bool: ...
     def release(self) -> None: ...
 
 RLock = _RLock
 
 class Condition:
-    def __init__(self, lock: Union[Lock, _RLock, None] = ...) -> None: ...
+    def __init__(self, lock: Lock | _RLock | None = ...) -> None: ...
     def __enter__(self) -> bool: ...
     def __exit__(
-        self, exc_type: Optional[Type[BaseException]], exc_val: Optional[BaseException], exc_tb: Optional[TracebackType]
-    ) -> Optional[bool]: ...
+        self, exc_type: Type[BaseException] | None, exc_val: BaseException | None, exc_tb: TracebackType | None
+    ) -> bool | None: ...
     def acquire(self, blocking: bool = ...) -> bool: ...
     def release(self) -> None: ...
-    def wait(self, timeout: Optional[float] = ...) -> bool: ...
+    def wait(self, timeout: float | None = ...) -> bool: ...
     def notify(self, n: int = ...) -> None: ...
     def notify_all(self) -> None: ...
     def notifyAll(self) -> None: ...
@@ -86,8 +86,8 @@ class Condition:
 class Semaphore:
     def __init__(self, value: int = ...) -> None: ...
     def __exit__(
-        self, exc_type: Optional[Type[BaseException]], exc_val: Optional[BaseException], exc_tb: Optional[TracebackType]
-    ) -> Optional[bool]: ...
+        self, exc_type: Type[BaseException] | None, exc_val: BaseException | None, exc_tb: TracebackType | None
+    ) -> bool | None: ...
     def acquire(self, blocking: bool = ...) -> bool: ...
     def __enter__(self, blocking: bool = ...) -> bool: ...
     def release(self) -> None: ...
@@ -100,7 +100,7 @@ class Event:
     def isSet(self) -> bool: ...
     def set(self) -> None: ...
     def clear(self) -> None: ...
-    def wait(self, timeout: Optional[float] = ...) -> bool: ...
+    def wait(self, timeout: float | None = ...) -> bool: ...
 
 class Timer(Thread):
     def __init__(