dh_setup_copyright: Reproducibility and performance fixes

See individual commits for details. Supersedes !34 (closed).

https://phabricator.apertis.org/T10511

https://phabricator.apertis.org/T10512

approved this merge request

It looks OK to me, but I would like to have a second opinion since we are already on a freeze for v2025dev2 and v2024.

I have run some tests and everything looks fine

• metadata is sorted, devscripts can be built
• performance has improved

cc @daissi

changed the description

mentioned in merge request rustc!17 (closed)

mentioned in merge request rustc!16 (closed)

added 1 commit

• 9fb16793 - Release debhelper version 13.11.4+apertis7

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enabled an automatic merge when the pipeline for 9fb16793 succeeds

merged