fix: atomit wait does not sleep long enough (#5315)

From the documentation of `CondVar::wait_timeout`:

> The semantics of this function are equivalent to wait except that the thread
> will be blocked for roughly no longer than `dur`. This method should not be
> used for precise timing due to anomalies such as preemption or platform
> differences that might not cause the maximum amount of time waited to be
> precisely `dur`.

Therefore, go to sleep again, if the thread has not slept long enough.

Signed-off-by: Harald Hoyer <harald@profian.com>

Signed-off-by: Harald Hoyer <harald@profian.com>

crates/runtime/src/parking_spot.rs

@@ -115,7 +115,14 @@ impl ParkingSpot {
 
             let spot = inner.get_mut(&key).expect("failed to get spot");
 
-            if !timed_out {
+            if timed_out {
+                if let Some(timeout) = timeout {
+                    if Instant::now() < timeout {
+                        // Did not sleep long enough, try again.
+                        continue;
+                    }
+                }
+            } else {
                 if spot.to_unpark == 0 {
                     continue;
                 }