Enhancement: Add support for PHP 8.0

[localheinz]

This pull request

• adds support for PHP 8.0

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.52%. Comparing base (bbe730b) to head (3a27c7d).
Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #877   +/-   ##
=========================================
  Coverage     85.52%   85.52%           
  Complexity      208      208           
=========================================
  Files            23       23           
  Lines           739      739           
=========================================
  Hits            632      632           
  Misses          107      107           

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