Enhancement: Add support for PHP 7.3

[localheinz]

This pull request

• adds support for PHP 7.3

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.89%. Comparing base (8c99fd5) to head (12d25e7).

❗ Current head 12d25e7 differs from pull request most recent head a1079d2

Please upload reports for the commit a1079d2 to get more accurate results.

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #930   +/-   ##
=========================================
  Coverage     92.89%   92.89%           
  Complexity       52       52           
=========================================
  Files             6        6           
  Lines           169      169           
=========================================
  Hits            157      157           
  Misses           12       12           

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