Update TestGeoviews (#1383)

looks like Geoviews now requires loading a backend plotting extension

updated test to do this.

tested locally

cc: @jplotts

Dockerfile.tmpl

@@ -270,7 +270,8 @@ RUN apt-get install -y libfreetype6-dev && \
 RUN pip install opencv-contrib-python opencv-python && \
     /tmp/clean-layer.sh
 
-RUN pip install scipy \
+# Pin scipy until we update JAX b/335003097
+RUN pip install scipy==1.12.0 \
         # Scikit-learn accelerated library for x86
         scikit-learn-intelex>=2023.0.1 \
         # HDF5 support

tests/test_geoviews.py

@@ -1,11 +1,12 @@
 import unittest
 
 import geoviews.feature as gf
-
+import holoviews as hv
 from cartopy import crs
 
 class TestGeoviews(unittest.TestCase):
     def test_viz(self):
+        hv.extension('matplotlib')
         (gf.ocean + gf.land + gf.ocean * gf.land * gf.coastline * gf.borders).options(
             'Feature', projection=crs.Geostationary(), global_extent=True
         ).cols(3)