Make warnings hard errors in the test suite

[jenshnielsen]

And silence the one remaing warning

[jenshnielsen]

~~This does not work since the min ver job still triggers lots of deprecation warnings~~

[codecov[bot]]

Codecov Report

Merging #5507 (b27f12a) into main (069a79a) will decrease coverage by 0.01%. The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #5507      +/-   ##
==========================================
- Coverage   66.31%   66.30%   -0.01%     
==========================================
  Files         354      354              
  Lines       30951    30951              
==========================================
- Hits        20526    20523       -3     
- Misses      10425    10428       +3     

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 67.62%. Comparing base (fdac108) to head (8560b64).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5507   +/-   ##
=======================================
  Coverage   67.62%   67.62%           
=======================================
  Files         351      351           
  Lines       30561    30561           
=======================================
  Hits        20668    20668           
  Misses       9893     9893           

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