Fix: Remove Php71 rule set

[localheinz]

This pull request

• removes the Php71 rule set

[codecov]

Codecov Report

Merging #409 (ca321ba) into main (abb9090) will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff             @@
##                main      #409   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity         8         8           
===========================================
  Files              2         2           
  Lines             24        24           
===========================================
  Hits              24        24           

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