Update the PHP CS Fixer configuration

[mspirkov]

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

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.03%. Comparing base (fe63447) to head (a234eb7).
⚠️ Report is 96 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #787      +/-   ##
============================================
+ Coverage     94.40%   96.03%   +1.63%     
- Complexity      953     1044      +91     
============================================
  Files           108      122      +14     
  Lines          3018     3230     +212     
============================================
+ Hits           2849     3102     +253     
+ Misses          169      128      -41     

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