Merge bitcoin/bitcoin#24039: bug fix: prevent UnicodeDecodeError when opening log file in feature_init.py

9d3e95d [bugfix] prevent UnicodeDecodeError errors when opening log file in feature_init.py (sogoagain)

Pull request description:

  Should fix #23989

  To fix a bug, I modified `feature_init.py` to open the log file as a byte stream when opening it.
  thank you.

ACKs for top commit:
  MarcoFalke:
    review ACK 9d3e95d

Tree-SHA512: 6e3e57cac5f4865b3894ee4e9fcd9eb2690e824af20e34b4595722bd7043b0c3fe417cc1bfcff25fbab95c66418d3fce13434bd63d0244875a867d08853a5644

Author: MarcoFalke

test/functional/feature_init.py

@@ -93,7 +93,7 @@ def check_clean_start():
             additional_lines = random.randint(1, num_total_logs)
             self.log.debug(f"Starting node and will exit after {additional_lines} lines")
             node.start(extra_args=['-txindex=1'])
-            logfile = open(node.debug_log_path, 'r', encoding='utf8')
+            logfile = open(node.debug_log_path, 'rb')
 
             MAX_SECS_TO_WAIT = 10
             start = time.time()