[3.18] community/dar: upgrade to 2.7.11
This backport is warranted as we distribute 2.7.9 in alpine 3.18 and it contains a bug preventing archive restoration under certain conditions:
as reported on dar-support mailing-list, releases 2.7.9 to 2.7.11 suffer from a bug that avoids one to restore files that have been saved with binary delta (aka binary patch) based on a previous version also saved as a binary delta.
In other words, you can rely on binary delta for differential backup (= using a full backup as reference). But if the reference backup is an incremental or differential backup using binary delta, dar may fail to restore some files in their latest state.
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