Fix: Use ~ operator to limit compatibility with PHP versions

[localheinz]

This pull request

• uses the ~ operator to limit the compatibility with PHP versions

Follows ergebnis/php-package-template#1086.

[codecov]

Codecov Report

Merging #682 (31f302c) into main (9b326a3) will not change coverage.
The diff coverage is n/a.

❗ Current head 31f302c differs from pull request most recent head a4392b6. Consider uploading reports for the commit a4392b6 to get more accurate results

@@             Coverage Diff             @@
##                main      #682   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity         7         7           
===========================================
  Files              2         2           
  Lines             20        20           
===========================================
  Hits              20        20           

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