Update PHPUnit version requirement to include 13.0

[dereuromark]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.51%. Comparing base (e2b00e9) to head (6a3a394).
⚠️ Report is 2 commits behind head on 2.x.

Additional details and impacted files

@@            Coverage Diff            @@
##                2.x      #82   +/-   ##
=========================================
  Coverage     77.51%   77.51%           
  Complexity       42       42           
=========================================
  Files             1        1           
  Lines           129      129           
=========================================
  Hits            100      100           
  Misses           29       29           

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