Unpin pyvo dep

[jeffjennings]

@adrn

This PR removes a pin on the pyvo dependency.

The dependency is currently pinned to pyvo==1.2.0. This is causing several notebook executions to fail because of a call to the deprecated from astropy.utils.decorators import wraps from within pyvo 1.2.0. From version 1.2.1 onward, pyvo instead uses from functools import partial, wraps (pyvo changelog).

Unpinning 1.2.0 may break something else, but there's no comment in requirements.txt as to why it's pinned, so this is a first step to get the notebooks to execute.

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