Use ProcessPoolExecutor over ThreadPoolExecutor.

Signed-off-by: Jakub Dardzinski <kuba0221@gmail.com>

airflow/providers/openlineage/plugins/listener.py

@@ -17,7 +17,7 @@
 from __future__ import annotations
 
 import logging
-from concurrent.futures import ThreadPoolExecutor
+from concurrent.futures import ProcessPoolExecutor
 from datetime import datetime
 from typing import TYPE_CHECKING
 
@@ -250,7 +250,7 @@ def on_failure():
     @property
     def executor(self):
         if not self._executor:
-            self._executor = ThreadPoolExecutor(max_workers=8, thread_name_prefix="openlineage_")
+            self._executor = ProcessPoolExecutor(max_workers=1)
         return self._executor
 
     @hookimpl