ruff: Fix PLW1510 subprocess.run without explicit check argument.

Signed-off-by: Anders Kaseorg <anders@zulip.com>
(cherry picked from commit c43629a222)

zerver/tests/test_email_mirror.py

@@ -1490,6 +1490,7 @@ class TestScriptMTA(ZulipTestCase):
             input=mail,
             stdout=subprocess.PIPE,
             text=True,
+            check=False,
         )
         self.assertEqual(
             p.stdout,