Update posterior gpdfit branch to get newer touchstone functionality

[VisruthSK]

No description provided.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.73%. Comparing base (a7337f8) to head (df56db4).
⚠️ Report is 21 commits behind head on use-posterior-gpdfit.

Additional details and impacted files

@@                  Coverage Diff                  @@
##           use-posterior-gpdfit     #359   +/-   ##
=====================================================
  Coverage                 92.73%   92.73%           
=====================================================
  Files                        31       31           
  Lines                      3057     3057           
=====================================================
  Hits                       2835     2835           
  Misses                      222      222           

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