parking_lot.c should check for overflow in Windows _PySemaphore_PlatformWait code path

[colesbury]

Bug report

The cast in millis = (DWORD) (timeout / 1000000); may overflow because DWORD is an unsigned 32-bit integer and timeout is a 64-bit integer. We should clamp the result if the cast would overflow.

cpython/Python/parking_lot.c

Lines 93 to 105 in cc7e45c

	static int
	_PySemaphore_PlatformWait(_PySemaphore *sema, _PyTime_t timeout)
	{
	int res;
	#if defined(MS_WINDOWS)
	DWORD wait;
	DWORD millis = 0;
	if (timeout < 0) {
	millis = INFINITE;
	}
	else {
	millis = (DWORD) (timeout / 1000000);
	}

Noticed by @vstinner in #112733 (review)

Linked PRs

• gh-112804: Clamping timeout value for _PySemaphore_PlatformWait #124914
• [3.13] gh-112804: Clamping timeout value for _PySemaphore_PlatformWait (gh-124914) #124991

[corona10]

@colesbury, I am closing the issue if we need to reopen it. please let me know.

[colesbury]

Thanks for fixing this!