BF: add h5py.__version__ into the list of tokens for caching

[yarikoptic]

h5py 3.0 introduced breaking changes (see e.g. #282)
and hdmf yet to account for them. We better cache that version too to improve
consistency of outputs etc

[codecov]

Codecov Report

Merging #284 (142e21e) into master (39c62bc) will decrease coverage by 0.08%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #284      +/-   ##
==========================================
- Coverage   82.42%   82.34%   -0.09%     
==========================================
  Files          54       54              
  Lines        4598     4598              
==========================================
- Hits         3790     3786       -4     
- Misses        808      812       +4     

Flag	Coverage Δ
unittests	82.34% <100.00%> (-0.09%)	⬇️

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Impacted Files	Coverage Δ
dandi/pynwb_utils.py	86.16% <100.00%> (ø)
dandi/cli/cmd_organize.py	77.30% <0.00%> (-2.46%)	⬇️

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