Fix: helpers: git get_upstream_remote()

Fixes this error in aports git remote check when using pmbootstrap init.

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• 215dfcc6 - pmb.helpers.git: fix get_upstream_remote() (MR 2496)

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enabled an automatic merge when all merge checks for 215dfcc6 pass

mentioned in merge request pmaports!5813 (merged)

canceled the automatic merge

merged