Adapt test_response_decode_text_using_autodetect for chardet 6.0 (#3773)

tests/models/test_responses.py

@@ -1011,7 +1011,10 @@ def test_response_decode_text_using_autodetect():
 
     assert response.status_code == 200
     assert response.reason_phrase == "OK"
-    assert response.encoding == "ISO-8859-1"
+    # The encoded byte string is consistent with either ISO-8859-1 or
+    # WINDOWS-1252. Versions <6.0 of chardet claim the former, while chardet
+    # 6.0 detects the latter.
+    assert response.encoding in ("ISO-8859-1", "WINDOWS-1252")
     assert response.text == text