enhance request handling for JSON content, drop PHP 7.4 support

[zakhar-huzenko]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 96.15385% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 97.97%. Comparing base (8e938c5) to head (fd787fb).
⚠️ Report is 9 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/Context/ApiContext.php	96.15%	1 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             develop      #50      +/-   ##
=============================================
+ Coverage      88.66%   97.97%   +9.31%     
  Complexity        71       71              
=============================================
  Files              5        5              
  Lines            247      247              
=============================================
+ Hits             219      242      +23     
+ Misses            28        5      -23     

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