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

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

tests/postgres_tests/test_json.py

@@ -1,6 +1,5 @@
 import datetime
 import uuid
-from contextlib import suppress
 from decimal import Decimal
 
 from django.core import exceptions, serializers
@@ -12,9 +11,11 @@ from django.utils.html import escape
 from . import PostgreSQLTestCase
 from .models import JSONModel
 
-with suppress(ImportError):
+try:
     from django.contrib.postgres import forms
     from django.contrib.postgres.fields import JSONField
+except ImportError:
+    pass
 
 
 @skipUnlessDBFeature('has_jsonb_datatype')