chore: fix 404 status URL

Signed-off-by: peicuiping <ezc5@sina.cn>

chia/_tests/core/util/test_keychain.py

@@ -233,7 +233,7 @@ def test_utf8_nfkd(self):
         # Test code from trezor:
         # Copyright (c) 2013 Pavol Rusnak
         # Copyright (c) 2017 mruddy
-        # https://github.com/trezor/python-mnemonic/blob/master/test_mnemonic.py
+        # https://github.com/trezor/python-mnemonic/blob/master/tests/test_mnemonic.py
         # The same sentence in various UTF-8 forms
         words_nfkd = "Pr\u030ci\u0301s\u030cerne\u030c z\u030clut\u030couc\u030cky\u0301 ku\u030an\u030c u\u0301pe\u030cl d\u030ca\u0301belske\u0301 o\u0301dy za\u0301ker\u030cny\u0301 uc\u030cen\u030c be\u030cz\u030ci\u0301 pode\u0301l zo\u0301ny u\u0301lu\u030a"  # noqa: E501
         words_nfc = "P\u0159\xed\u0161ern\u011b \u017elu\u0165ou\u010dk\xfd k\u016f\u0148 \xfap\u011bl \u010f\xe1belsk\xe9 \xf3dy z\xe1ke\u0159n\xfd u\u010de\u0148 b\u011b\u017e\xed pod\xe9l z\xf3ny \xfal\u016f"  # noqa: E501