Add PHP 8.4 support

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[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 90.90%. Comparing base (a202fa9) to head (da06e3f).
Report is 4 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/Json.php	75.00%	1 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             develop      #10      +/-   ##
=============================================
- Coverage      98.64%   90.90%   -7.74%     
- Complexity         8        9       +1     
=============================================
  Files              1        1              
  Lines             74       77       +3     
=============================================
- Hits              73       70       -3     
- Misses             1        7       +6     

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