Updates due dependency version changes. (#1960)

* Updates due dependency version changes.

h5py recently changes and now values once returned as str are now returned as bytes.
This would have caused a much larger change, so instead the version is restricted to <3.0.0.

This caused the bulk of the testing failues.
A few other changes were needed to make a few other tests pass.

 #1959

server/requirements.txt

@@ -12,6 +12,7 @@ flatbuffers>=1.11.0
 flatten-dict>=0.2.0
 fsspec>=0.4.4,<0.8.0
 gunicorn>=20.0.4
+h5py<3.0.0 # h5py returns bytes instead of str, which breaks many assumptions
 numba>=0.49.1
 numpy>=1.15.0
 packaging>=20.0