Fix: Drop support for PHP 7.2

[localheinz]

This PR

• drops support for PHP 7.2

[codecov]

Codecov Report

Merging #493 (6f0d3d1) into main (393c196) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main     #493   +/-   ##
=========================================
  Coverage     99.04%   99.04%           
  Complexity      110      110           
=========================================
  Files            25       25           
  Lines           315      315           
=========================================
  Hits            312      312           
  Misses            3        3           

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