Update environment-py3.12.yml

Author: kthyng

ci/environment-py3.12.yml

@@ -14,7 +14,7 @@ dependencies:
   - kerchunk ==0.2.7
   - xarray
   - numpy <=1.26.4  # req from opendrift
-  - opendrift <=1.13.0
+  - opendrift ==1.13.0
   - scipy
   - dask
   - netcdf4