Fix: Rename .php_cs to .php-cs-fixer.php

[localheinz]

This pull request

• renames .php_cs to .php-cs-fixer.php

Follows #731.

[codecov]

Codecov Report

Merging #741 (7ed196d) into main (099814f) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main     #741   +/-   ##
=========================================
  Coverage     83.96%   83.96%           
  Complexity       57       57           
=========================================
  Files             4        4           
  Lines           237      237           
=========================================
  Hits            199      199           
  Misses           38       38           

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