chore(deps): bump flake8 from 7.1.2 to 7.2.0 (#1287)

Author: dependabot[bot]

requirements/tools.txt

@@ -1,3 +1,3 @@
 mypy==1.15.0
-flake8==7.1.2
+flake8==7.2.0
 black==24.8.0             # Until we drop Python 3.6 support, we have to stay with this version

slack_bolt/listener/thread_runner.py

@@ -111,7 +111,7 @@ def run(
             if not request.lazy_only:
                 # start the listener function asynchronously
                 def run_ack_function_asynchronously():
-                    nonlocal ack, request, response
+                    nonlocal response
                     try:
                         self.listener_start_handler.handle(
                             request=request,