gh-116656: Fix test_capi test_py_config_isoloated_per_interpreter() (#116658)

Don't parse argv when setting the configuration, to avoid SystemExit if parsing argv fails.

Author: vstinner

Lib/test/test_capi/test_misc.py

@@ -1797,6 +1797,7 @@ def test_py_config_isoloated_per_interpreter(self):
         # double checked at the time this test was written.
         config = _testinternalcapi.get_config()
         config['int_max_str_digits'] = 55555
+        config['parse_argv'] = 0
         _testinternalcapi.set_config(config)
         sub_value = _testinternalcapi.get_config()['int_max_str_digits']
         assert sub_value == 55555, sub_value