Update install command for feather-format, update test to check for i…

…nstalled library if needed

ci/gpu/build.sh

@@ -80,7 +80,7 @@ pip install cupy-cuda92
 
 # Temporarily install feather for testing
 logger "conda install feather-format"
-conda install -y feather-format
+conda install -c conda-forge -y feather-format
 
 logger "Python py.test for libcudf..."
 cd $WORKSPACE/cpp/build/python

python/cudf/tests/test_feather.py

@@ -56,6 +56,16 @@ def gdf(pdf):
 
 @pytest.fixture
 def feather_file(tmp_path_factory, pdf):
+    from distutils.version import LooseVersion
+    if LooseVersion(pd.__version__) < LooseVersion('0.24'):
+        try:
+            import feather # noqa F401
+            _have_feather = True
+        except ImportError:
+            _have_feather = False
+        if not _have_feather:
+            pytest.skip('Feather is not installed and is required for Pandas <'
+                        ' 0.24')
     fname = tmp_path_factory.mktemp("feather") / "test.feather"
     pdf.to_feather(fname)
     return fname