message: test: use f-strings in feature_help.py
diff: @@ -40,14 +40,14 @@ class HelpTest(BitcoinTestFramework):
  # Node should exit immediately and output help to stdout.
  output, _ = self.get_node_output(ret_code_expected=0)
  assert b'Options' in output
  - self.log.info("Help text received: {} (...)".format(output[0:60]))
  + self.log.info(f"Help text received: {output[0:60]} (...)")
  self.log.info("Start bitcoin with -version for version information")
  self.nodes[0].start(extra_args=['-version'])
  # Node should exit immediately and output version to stdout.
  output, _ = self.get_node_output(ret_code_expected=0)
  assert b'version' in output
  - self.log.info("Version text received: {} (...)".format(output[0:60]))
  + self.log.info(f"Version text received: {output[0:60]} (...)")
  # Test that arguments not in the help results in an error
  self.log.info("Start bitcoind with -fakearg to make sure it does not start")
  @@ -55,7 +55,7 @@ class HelpTest(BitcoinTestFramework):
  # Node should exit immediately and output an error to stderr
  _, output = self.get_node_output(ret_code_expected=1)
  assert b'Error parsing command line arguments' in output
  - self.log.info("Error message received: {} (...)".format(output[0:60]))
  + self.log.info(f"Error message received: {output[0:60]} (...)")
  if __name__ == '__main__':
  