sysutils/py-borgmatic: update 1.3.26 to 1.5.4

• builds fine for 11/12/head, multiple archs;
• creating config from scratch wotks;
• making a backup works;
• restoring from a backup also works.

PR: 245222
Reported by: Victor Bouvier-Deleau <victor.bouvier-deleau % kolabnow.com>