Reverted "Fixed #27818 -- Replaced try/except/pass with contextlib.suppress()."

This reverts commit 550cb3a365
because try/except performs better.

tests/bash_completion/tests.py

@@ -4,7 +4,6 @@ A series of tests to establish that the command-line bash completion works.
 import os
 import sys
 import unittest
-from contextlib import suppress
 
 from django.apps import apps
 from django.core.management import ManagementUtility
@@ -51,8 +50,10 @@ class BashCompletionTests(unittest.TestCase):
     def _run_autocomplete(self):
         util = ManagementUtility(argv=sys.argv)
         with captured_stdout() as stdout:
-            with suppress(SystemExit):
+            try:
                 util.autocomplete()
+            except SystemExit:
+                pass
         return stdout.getvalue().strip().split('\n')
 
     def test_django_admin_py(self):