Remove h5py installation step (kubeflow#1955)

h5py 2.9 is not compatible with the tensorflow version required by alibiexplainer. Should just use the version pulled in by alibiexplainer

kserve/kserve#1951 (comment)
Signed-off-by: Mark Edward Winter <wintermarkedward@gmail.com>

.github/workflows/python-test.yml

@@ -56,5 +56,4 @@ jobs:
         pip install -e ./paddleserver[test]
         pytest ./paddleserver
         pip install -e ./alibiexplainer
-        pip install h5py==2.9.0
         pytest ./alibiexplainer