Remove soon to be deprecated jsonschema.RefResolver

[h-mayorquin]

Should close #1048.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.69%. Comparing base (dcd248b) to head (d60f12d).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1133   +/-   ##
=======================================
  Coverage   90.69%   90.69%           
=======================================
  Files         129      129           
  Lines        8186     8187    +1     
=======================================
+ Hits         7424     7425    +1     
  Misses        762      762           

Flag	Coverage Δ
unittests	90.69% <100.00%> (+<0.01%)	⬆️

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Files with missing lines	Coverage Δ
...on_specification/_yaml_conversion_specification.py	97.18% <100.00%> (+0.04%)	⬆️

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