GEOPY-2561: fix return typehint

[sebhmg]

GEOPY-2561 - pylint failure in tests of simpeg-drivers: no data_misfit member

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.68%. Comparing base (eef0e79) to head (ff99cd0).
⚠️ Report is 2 commits behind head on release/ga-4.7.

Additional details and impacted files

@@               Coverage Diff               @@
##           release/ga-4.7     #169   +/-   ##
===============================================
  Coverage           85.68%   85.68%           
===============================================
  Files                  19       19           
  Lines                1090     1090           
  Branches              147      147           
===============================================
  Hits                  934      934           
  Misses                116      116           
  Partials               40       40           

Files with missing lines	Coverage Δ
geoapps_utils/base.py	91.17% <100.00%> (ø)

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