fix: added phpunit version constrain for higher php versions

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[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@6d44163). Click here to learn what that means.
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@@            Coverage Diff            @@
##             master      #87   +/-   ##
=========================================
  Coverage          ?   57.26%           
  Complexity        ?      149           
=========================================
  Files             ?       34           
  Lines             ?      564           
  Branches          ?        0           
=========================================
  Hits              ?      323           
  Misses            ?      241           
  Partials          ?        0

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