ci: ensure same poku major version across runtimes

[wellwelwel]

Related:

• https://github.com/mysqljs/sql-escaper/actions/runs/26344018828/job/77552526657?pr=27

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (09e7e65) to head (a5236fe).
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Additional details and impacted files

@@            Coverage Diff            @@
##              main       #29   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines          401       401           
=========================================
  Hits           401       401           

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