Remove ext-json from require section of composer.json

[Tigrov]

Related PR

• Remove yiisoft/json from require-dev section of composer.json db#938

Q	A
Is bugfix?	❌
New feature?	❌
Breaks BC?	❌
Fixed issues

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.02%. Comparing base (846f5c5) to head (6bda58f).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #406   +/-   ##
=========================================
  Coverage     88.02%   88.02%           
  Complexity      575      575           
=========================================
  Files            16       16           
  Lines          1369     1369           
=========================================
  Hits           1205     1205           
  Misses          164      164           

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