[threading] Add missing default values (#14458)

Author: donBarbos

stdlib/_thread.pyi

@@ -73,7 +73,7 @@ def start_new(function: Callable[[Unpack[_Ts]], object], args: tuple[Unpack[_Ts]
 def start_new(function: Callable[..., object], args: tuple[Any, ...], kwargs: dict[str, Any], /) -> int: ...
 
 if sys.version_info >= (3, 10):
-    def interrupt_main(signum: signal.Signals = ..., /) -> None: ...
+    def interrupt_main(signum: signal.Signals = signal.SIGINT, /) -> None: ...
 
 else:
     def interrupt_main() -> None: ...

stdlib/threading.pyi

@@ -142,7 +142,7 @@ class Condition:
     def __exit__(
         self, exc_type: type[BaseException] | None, exc_val: BaseException | None, exc_tb: TracebackType | None
     ) -> None: ...
-    def acquire(self, blocking: bool = ..., timeout: float = ...) -> bool: ...
+    def acquire(self, blocking: bool = True, timeout: float = -1) -> bool: ...
     def release(self) -> None: ...
     def wait(self, timeout: float | None = None) -> bool: ...
     def wait_for(self, predicate: Callable[[], _T], timeout: float | None = None) -> _T: ...