Update _thread to 3.14 (#14163)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

stdlib/@tests/stubtest_allowlists/py314.txt

@@ -4,8 +4,6 @@
 
 _asyncio.all_tasks
 _imp.pyc_magic_number_token
-_thread.RLock.locked
-_thread.set_name
 asyncio.eager_task_factory
 asyncio.tasks.eager_task_factory
 compression.gzip.GzipFile.readinto

stdlib/_thread.pyi

@@ -18,6 +18,8 @@ class RLock:
     def release(self) -> None: ...
     __enter__ = acquire
     def __exit__(self, t: type[BaseException] | None, v: BaseException | None, tb: TracebackType | None) -> None: ...
+    if sys.version_info >= (3, 14):
+        def locked(self) -> bool: ...
 
 if sys.version_info >= (3, 13):
     @final
@@ -105,6 +107,9 @@ _excepthook: Callable[[_ExceptHookArgs], Any]
 if sys.version_info >= (3, 12):
     def daemon_threads_allowed() -> bool: ...
 
+if sys.version_info >= (3, 14):
+    def set_name(name: str) -> None: ...
+
 class _local:
     def __getattribute__(self, name: str, /) -> Any: ...
     def __setattr__(self, name: str, value: Any, /) -> None: ...