Update napari dependency version constraint

Specify napari version constraint due to compatibility issue.

Author: anwai98

environment.yaml

@@ -5,7 +5,7 @@ dependencies:
     - nifty >=1.2.3
     - imagecodecs
     - magicgui
-    - napari
+    - napari <0.7  # Note: See https://github.com/napari/napari/issues/8808 for more details.
     - natsort
     - pip
     - pooch