ci(psalm): set up the minimum supported php version

[st3iny]

Upstream fix at nextcloud/.github#461

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (master@542da89). Learn more about missing BASE report.
⚠️ Report is 103 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #1581   +/-   ##
=========================================
  Coverage          ?   42.50%           
  Complexity        ?      102           
=========================================
  Files             ?       19           
  Lines             ?      327           
  Branches          ?        0           
=========================================
  Hits              ?      139           
  Misses            ?      188           
  Partials          ?        0           

Flag	Coverage Δ
unittests	42.50% <ø> (?)

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