migrate from JSON3 to JSON

[palday]

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Did behavior change? Did you add need features? If so, please update NEWS.md

• add entry in NEWS.md
• after opening this PR, add a reference and run docs/NEWS-update.jl to update the cross-references.

Should we release your changes right away? If so, bump the version:

• I've bumped the version appropriately

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.70%. Comparing base (0853e19) to head (371f69b).
⚠️ Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #897      +/-   ##
==========================================
+ Coverage   95.69%   95.70%   +0.01%     
==========================================
  Files          38       38              
  Lines        3760     3772      +12     
==========================================
+ Hits         3598     3610      +12     
  Misses        162      162              

Flag	Coverage Δ
current	95.38% <100.00%> (+0.01%)	⬆️
minimum	95.59% <100.00%> (+0.01%)	⬆️
nightly	95.38% <100.00%> (+0.01%)	⬆️

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