Suguru Hirahara 9ffd40bcd2
Remove an obsolete variable: backup_borg_retention_prefix
It has been removed with 30f0f92dc5 for updating borgmatic to v1.8.2.

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>
2025-01-16 23:07:42 +09:00
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