MNT: Update netcdf to latest scipy

[effigies]

Seems numpy's release has forced our hand. No longer clear that tests will ensure we're getting mmaps. I'll open an issue with scipy.

Fixes #1108.

[codecov]

Codecov Report

Merging #1110 (9200261) into master (9fbddef) will decrease coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1110      +/-   ##
==========================================
- Coverage   92.29%   92.25%   -0.05%     
==========================================
  Files         100      100              
  Lines       12247    12247              
  Branches     2393     2393              
==========================================
- Hits        11303    11298       -5     
- Misses        621      624       +3     
- Partials      323      325       +2     

Impacted Files	Coverage Δ
nibabel/nifti1.py	92.13% <0.00%> (-0.46%)	⬇️
nibabel/volumeutils.py	93.73% <0.00%> (-0.44%)	⬇️

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[effigies]

Issue opened FWIW: scipy/scipy#16285