IntervalRunner: don't wait for interval_seconds on shutdown (#1035)

slack_sdk/socket_mode/interval_runner.py

@@ -1,5 +1,4 @@
 import threading
-import time
 from threading import Thread, Event
 from typing import Callable
 
@@ -18,7 +17,7 @@ def __init__(self, target: Callable[[], None], interval_seconds: float = 0.1):
     def _run(self) -> None:
         while not self.event.is_set():
             self.target()
-            time.sleep(self.interval_seconds)
+            self.event.wait(self.interval_seconds)
 
     def start(self) -> "IntervalRunner":
         self.thread.start()