fix warnings

[jlaehne]

fix warnings in tests/utils/test_axis-conversion.py

• fixed warnings introduced by Jacobian transformation of the variance model #98
• add missing catch for warning mentioned in Test deprecation warning #54

[codecov-commenter]

Codecov Report

Merging #104 (a6af1c8) into main (047d975) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #104   +/-   ##
=======================================
  Coverage   95.69%   95.69%           
=======================================
  Files          11       11           
  Lines         581      581           
=======================================
  Hits          556      556           
  Misses         25       25           

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