Update test_geopandas.yml

Author: Conengmo

.github/workflows/test_geopandas.yml

@@ -33,6 +33,7 @@ jobs:
     - name: Install Geopandas dev dependencies
       run: |
         pip install -r geopandas/requirements-dev.txt
+        pip install geodatasets
 
     - name: Install folium from source
       run: |