Fix installation on Python 3.8 due to missing Tensorflow-io wheel #759
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TensorFlow IO v0.35.0 was released in December 19th. That release in PyPI does not provide many platform wheels that were provided by v0.34.0. See the tracking issue tensorflow/io#1906.
Now Annif installation with NN ensemble backend fails on Python 3.8 (there were some failed CI runs).
We may want to drop support for Python 3.8 for Annif v1.1, but for the meantime, this fixes the installation by making TensorFlow IO a direct dependency for Python 3.8 and pins its version to 0.34.*.