Minimal stdexec::task sample crashes on windows

[maxbachmann]

static inline stdexec::task<void> task()
{
    co_return;
}

stdexec::sync_wait(task());

crashes on windows (msvc). The crash occurs in:

static constexpr auto await_suspend(__std::coroutine_handle<__promise> __coro) noexcept  //
    -> __std::coroutine_handle<>
{
    return __coro.promise().__state_->__completed();
}

with an access violation error. Using exec::task for the same sample doesn't crash.

It's worth noting that we had the opposite problem on a different x64 target (proprietary platform using a clang fork) where this sample would only crash for exec::task but not for stdexec::task. I didn't report this back then since stdexec::task fixed the issue and I wasn't able to reproduce the crash on other targets. There the crash was attributes as a general protection fault in static auto __co_impl when running co_await static_cast<_Awaitable&&>(__awaitable)