test: Use pathlib over os.path #28362

revert netutil chgs py3.8 compliant

fixes based on PR review

test/functional/wallet_blank.py

@@ -3,7 +3,6 @@
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or https://www.opensource.org/licenses/mit-license.php.
 
-import os
 
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.address import (
@@ -110,7 +109,7 @@ class WalletBlankTest(BitcoinTestFramework):
         assert_equal(info["descriptors"], False)
         assert_equal(info["blank"], True)
 
-        wallet_dump_path = os.path.join(self.nodes[0].datadir, "wallet.dump")
+        wallet_dump_path = self.nodes[0].datadir_path / "wallet.dump"
         def_wallet.dumpwallet(wallet_dump_path)
 
         wallet.importwallet(wallet_dump_path)