test: use ExtendedPrivateKey in feature_notifications.py

test/functional/feature_notifications.py

@@ -11,6 +11,7 @@ from test_framework.blocktools import (
     create_block,
 )
 from test_framework.descriptors import descsum_create
+from test_framework.extendedkey import ExtendedPrivateKey
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import (
     assert_equal,
@@ -74,7 +75,7 @@ class NotificationsTest(BitcoinTestFramework):
     def run_test(self):
         if self.is_wallet_compiled():
             # Setup the descriptors to be imported to the wallet
-            xpriv = "tprv8ZgxMBicQKsPfHCsTwkiM1KT56RXbGGTqvc2hgqzycpwbHqqpcajQeMRZoBD35kW4RtyCemu6j34Ku5DEspmgjKdt2qe4SvRch5Kk8B8A2v"
+            xpriv = ExtendedPrivateKey.generate().to_string()
             desc_imports = [{
                 "desc": descsum_create(f"wpkh({xpriv}/0/*)"),
                 "timestamp": 0,