fix: correctly handle git_hash

[steven-murray]

Fixes an issue with trying to use deprecated git_hash.

[codecov[bot]]

Codecov Report

Merging #364 (201e5ee) into main (9b1270f) will increase coverage by 0.17%. The diff coverage is 84.61%.

@@            Coverage Diff             @@
##             main     #364      +/-   ##
==========================================
+ Coverage   95.80%   95.97%   +0.17%     
==========================================
  Files          17       17              
  Lines        6055     6016      -39     
==========================================
- Hits         5801     5774      -27     
+ Misses        254      242      -12     

Flag	Coverage Δ
unittests	95.97% <84.61%> (+0.17%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
hera_pspec/pspecdata.py	97.03% <ø> (+0.05%)	:arrow_up:
hera_pspec/pstokes.py	92.85% <ø> (+0.62%)	:arrow_up:
hera_pspec/testing.py	97.47% <ø> (ø)
hera_pspec/container.py	94.09% <80.00%> (+1.87%)	:arrow_up:
hera_pspec/grouping.py	97.92% <100.00%> (+0.36%)	:arrow_up:
hera_pspec/uvpspec.py	97.54% <100.00%> (+0.18%)	:arrow_up:

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