Pin h5py version

[IgorTatarnikov]

See openbraininstitute/MorphIO#35

Once resolved we can unpin.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.37%. Comparing base (e1a5625) to head (7bc7810).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #109      +/-   ##
==========================================
+ Coverage   71.27%   72.37%   +1.10%     
==========================================
  Files          10       10              
  Lines         724      724              
==========================================
+ Hits          516      524       +8     
+ Misses        208      200       -8     

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