Add necessary requirement for current version of zarr

Author: JMGilbert

requirements.txt

@@ -15,3 +15,4 @@ h5netcdf==1.5.0
 impactlab-tools==0.6.0
 p_tqdm==1.4.2
 pyarrow==19.0.0
+numcodecs==0.15.1

src/dscim/preprocessing/input_damages.py

@@ -809,7 +809,7 @@ def prep(
             if damages[v].dtype == object:
                 damages[v] = damages[v].astype("unicode")
 
-        damages['gcm'] = damages['gcm'].astype("U" + str(max_gcm_len))
+        damages["gcm"] = damages["gcm"].astype("U" + str(max_gcm_len))
 
         if i == 0:
             damages.to_zarr(