Fix: Drop support for PHP 7.4

[localheinz]

This pull request

• drops support for PHP 7.4

[codecov]

Codecov Report

Merging #550 (fa97007) into main (f5583e1) will not change coverage.
The diff coverage is n/a.

❗ Current head fa97007 differs from pull request most recent head d1c945a. Consider uploading reports for the commit d1c945a to get more accurate results

@@            Coverage Diff            @@
##               main     #550   +/-   ##
=========================================
  Coverage     98.82%   98.82%           
  Complexity       63       63           
=========================================
  Files            15       15           
  Lines           170      170           
=========================================
  Hits            168      168           
  Misses            2        2           

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