Pin numpy to <2.0 to fix zarr compatibility

The zarr library uses np.PINF which was removed in NumPy 2.0.
This constraint prevents pip installs from upgrading numpy beyond 1.x.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: adamjtaylor

docker/environment.yml

@@ -5,7 +5,7 @@ channels:
   - fastai
   - bioconda
 dependencies:
-  - numpy=1.23.0
+  - numpy>=1.23.0,<2.0
   - Pillow
   - flask
   - waitress