update A(V) calc to use latest - Decleir et al. (2022)

[karllark]

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[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 41.04%. Comparing base (de1f372) to head (c310a85).

Files	Patch %	Lines
measure_extinction/extdata.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #118      +/-   ##
==========================================
+ Coverage   41.01%   41.04%   +0.02%     
==========================================
  Files          21       21              
  Lines        2865     2863       -2     
==========================================
  Hits         1175     1175              
+ Misses       1690     1688       -2     

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