fix(serial.py): Pytest-embedded leaks file descriptors when used with…

… pytest-lazy-fixture

pytest-embedded-serial/pytest_embedded_serial/serial.py

@@ -106,6 +106,7 @@ def stop_redirect_thread(self) -> bool:
         if self._redirect_thread and self._redirect_thread.is_alive():
             self._redirect_thread.terminate()
             killed = True
+            del self._redirect_thread
 
         return killed
 
@@ -189,6 +190,9 @@ def _event_loop(self):
             elif _e == 'start':
                 self._block_reading = False
             elif _e == 'end':
+                self._event_q.close()
+                while not self._event_q.empty():
+                    _ = self._event_q.get_nowait()
                 return
 
             time.sleep(0.05)  # set interval