Fix timeout on progress thread (deadlocking)

Author: jeromekelleher

bio2zarr/core.py

@@ -220,7 +220,7 @@ def __exit__(self, exc_type, exc_val, exc_tb):
             # Note: this doesn't seem to be working correctly. If
             # we set a timeout of None we get deadlocks
             set_progress(self.progress_config.total)
-            timeout = None
+            timeout = 0.1
         else:
             cancel_futures(self.futures)
             timeout = 0