Fix: Remove jangregor/phpstan-prophecy

[localheinz]

This pull request

• removes jangregor/phpstan-prophecy

[codecov]

Codecov Report

Merging #664 (ded2451) into main (683983f) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main     #664   +/-   ##
=========================================
  Coverage     98.48%   98.48%           
  Complexity      110      110           
=========================================
  Files            25       25           
  Lines           330      330           
=========================================
  Hits            325      325           
  Misses            5        5           

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