Update the PHP CS Fixer configuration

[mspirkov]

Q	A
Is bugfix?	❌
New feature?	❌
Breaks BC?	❌
Fixed issues	comma-separated list of tickets # fixed by the PR, if any

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.82%. Comparing base (c801bd7) to head (5a2061c).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #392   +/-   ##
=========================================
  Coverage     97.82%   97.82%           
  Complexity      250      250           
=========================================
  Files            26       26           
  Lines           828      828           
=========================================
  Hits            810      810           
  Misses           18       18           

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