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

[localheinz]

This pull request

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

Follows #578.

[codecov]

Codecov Report

Merging #628 (663cab0) into main (9a44a62) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main     #628   +/-   ##
=========================================
  Coverage     99.04%   99.04%           
  Complexity      110      110           
=========================================
  Files            25       25           
  Lines           315      315           
=========================================
  Hits            312      312           
  Misses            3        3           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 9a44a62...663cab0. Read the comment docs.