debian: Set main as the debian-branch
Make gbp happy and avoid the following error:
gbp:error: You are not on branch 'master' but on 'main'
gbp:error: Use --git-ignore-branch to ignore or --git-debian-branch to set the branch name.
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Make gbp happy and avoid the following error:
gbp:error: You are not on branch 'master' but on 'main'
gbp:error: Use --git-ignore-branch to ignore or --git-debian-branch to set the branch name.