Update Python version in test code

nsist/tests/test_main.py

@@ -84,7 +84,7 @@ def test_installer(console_eg_copy, tmp_path):
     json_res = json.loads(res.stdout.decode('utf-8', 'replace'))
 
     assert json_res['py_executable'] == str(inst_python)
-    assert json_res['py_version'].startswith('3.6.3')  # Set in installer.cfg
+    assert json_res['py_version'].startswith('3.8.3')  # Set in installer.cfg
     assert json_res['data_file_path'].endswith('data.txt')
     assert json_res['data_file_content'] == 'newt'