twister: terminate_process: use contextlib.suppress

While it doesn't cause any issues, it's more consistent and makes future
commits which add handling for more exception types more readable.

Based on: 0df8240b49

Signed-off-by: Michael Zimmermann <sigmaepsilon92@gmail.com>

scripts/pylib/pytest-twister-harness/src/twister_harness/device/utils.py

@@ -4,6 +4,7 @@
 
 from __future__ import annotations
 
+import contextlib
 import logging
 import os
 import platform
@@ -42,10 +43,8 @@ def terminate_process(proc: subprocess.Popen) -> None:
     Try to terminate provided process and all its subprocesses recursively.
     """
     for child in psutil.Process(proc.pid).children(recursive=True):
-        try:
+        with contextlib.suppress(ProcessLookupError, psutil.NoSuchProcess):
             os.kill(child.pid, signal.SIGTERM)
-        except (ProcessLookupError, psutil.NoSuchProcess):
-            pass
     proc.terminate()
     # sleep for a while before attempting to kill
     time.sleep(0.5)