Fix ref for scheduled build (backport #248)

[mergify]

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This is an automatic backport of pull request #248 done by [Mergify](https://mergify.com).

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.45%. Comparing base (7d2ebd3) to head (59fb384).

Additional details and impacted files

@@           Coverage Diff           @@
##           humble     #249   +/-   ##
=======================================
  Coverage   73.45%   73.45%           
=======================================
  Files           9        9           
  Lines         550      550           
  Branches      215      215           
=======================================
  Hits          404      404           
+ Misses         96       89    -7     
- Partials       50       57    +7     

Flag	Coverage Δ
unittests	73.45% <ø> (ø)

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see 1 file with indirect coverage changes