CI script fails to detect changed aports after merge

https://gitlab.postmarketos.org/postmarketos/pmaports/-/jobs/95797091

$ su pmos -c ".gitlab-ci/build_changed_aports.py"
branch: HEAD
comparing HEAD with: 23ba0dd94ca49a6c816ef3289efceb5c46c8a0e2
changed file(s):
no aports changed in this branch

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