fix: Date fields are now properly serialized as ISO dates, i.e. "YYYY-MM-DD"

[edgarrmondragon]

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📚 Documentation preview 📚: https://meltano-sdk--2580.org.readthedocs.build/en/2580/

[codspeed-hq]

CodSpeed Performance Report

Merging #2580 will not alter performance

_{Comparing 1831-bug-json-serialization-of-date-types-causes-schema-validation-to-fail-in-target-postgres (32f2f87) with main (81d91f3)}

Summary

✅ 6 untouched benchmarks

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.47%. Comparing base (81d91f3) to head (32f2f87).
Report is 117 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2580      +/-   ##
==========================================
- Coverage   89.51%   89.47%   -0.05%     
==========================================
  Files          58       58              
  Lines        4798     4798              
  Branches      936      936              
==========================================
- Hits         4295     4293       -2     
- Misses        350      352       +2     
  Partials      153      153              

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