chore: set parallel config on php-cs-fixer

[rancoud]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.65%. Comparing base (bfc3c0e) to head (a4eeee3).
Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #251      +/-   ##
============================================
+ Coverage     91.60%   91.65%   +0.04%     
- Complexity      192      200       +8     
============================================
  Files            11       11              
  Lines           572      575       +3     
============================================
+ Hits            524      527       +3     
  Misses           48       48              

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