Remove dependency in ext-json

[acelaya]

Closes #2565

Remove explicit dependency in ext-json, since it's part of PHP since v8.0

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.61%. Comparing base (900de9e) to head (9641c70).
⚠️ Report is 3 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff             @@
##             develop    #2566   +/-   ##
==========================================
  Coverage      94.61%   94.61%           
  Complexity      1637     1637           
==========================================
  Files            273      273           
  Lines           5111     5111           
==========================================
  Hits            4836     4836           
  Misses           275      275           

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