text: Title: Lazy listeners do not work with Chalice local testing server
  Body: I want to perform operations when a member has joined a channel which takes more than 5 seconds, but I'm getting **BrokenPipeError: [Errno 32] Broken pipe**.
  
  
  The minimal step to reproduce the same has been shown below while using the lazy listener it waits for 10 seconds before responding back.
  
  
  ### Reproducible in:
  
  ```python
  from chalice import Chalice, Response
  from slack_bolt import App
  from slack_bolt.adapter.aws_lambda.chalice_handler import ChaliceSlackRequestHandler
  
  bolt_app = App(process_before_response=True)
  app = Chalice(app_name='chalice_app_name')
  slack_handler = ChaliceSlackRequestHandler(app=bolt_app, chalice=app)
  
  
  @bolt_app.event("message")
  def handle_message_events(body, logger):
      logger.info(body['event']['text'])
  
  
  def respond_to_slack_within_3_seconds(ack):
      ack("Accepted!")
  
  
  def say_it(say):
      time.sleep(10)
      say("Done!")
  
  
  bolt_app.event("member_joined_channel")(
      ack=respond_to_slack_within_3_seconds, lazy=[say_it]
  )
  
  
  @app.route(
      "/slack/events",
      methods=["POST"],
      content_types=["application/x-www-form-urlencoded", "application/json"],
  )
  def events() -> Response:
      return slack_handler.handle(app.current_request)
  
  ```
  
  #### The `slack_bolt` version
  slack-bolt==1.9.1
  slack-sdk==3.11.1
  
  #### Python runtime version
  Python 3.6.15
  
  #### OS info
  Ubuntu 20.04.3 LTS
  
  #### Steps to reproduce:
  1. While handling of any Slack event (e.g. handle_member_joined event)
  2. Use lazy listener and wait for more than 3 seconds before responding back to Slack 
  
  ### Expected result:
  Since the event is acknowledging the Slack within 3 seconds irrespective of the lazy listener function time, it should have processed the same.
  
  ### Actual result:
  ![s1](https://user-images.githubusercontent.com/86968068/136534125-e43559c7-6559-4fa7-82d8-d46119b1a388.png)
  ![s2](https://user-images.githubusercontent.com/86968068/136532810-112bcd00-24f7-45c7-b06b-6e6bee25f15e.png)
  
  
  ## Requirements
  
  Please read the [Contributing guidelines](https://github.com/slackapi/bolt-python/blob/main/.github/contributing.md) and [Code of Conduct](https://slackhq.github.io/code-of-conduct) before creating this issue or pull request. By submitting, you are agreeing to those rules.
  