Fix cadence auto update CI not running

[janezpodhostnik]

... when auto-cadence-upgrade/ is the base branch.

If it does it will make it easier to tell which cadence updates are ready to merge.

[codecov-commenter]

Codecov Report

Merging #941 (7b1ac3d) into master (17a7b7c) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #941   +/-   ##
=======================================
  Coverage   54.92%   54.92%           
=======================================
  Files         277      277           
  Lines       18339    18339           
=======================================
  Hits        10073    10073           
  Misses       6902     6902           
  Partials     1364     1364           

Flag	Coverage Δ
unittests	54.92% <ø> (ø)

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[huitseeker]

👍
Future reviewer: see https://docs.github.com/en/actions/reference/workflow-syntax-for-github-actions#filter-pattern-cheat-sheet for the parsing explanation

[turbolent]

👍