Update qbar

pkgs/qbar/repo.json

 {
   "ref": "refs/heads/master",
   "url": "https://git.c3pb.de/jens/qbar.git",
-  "rev": "f4a9fceacd46697a625283eaa08302794f11f662",
-  "date": "2021-04-02T00:35:39+02:00",
-  "path": "/nix/store/f54dagqkvdxzzgczgsghdaf5nnvz9c6m-qbar",
-  "sha256": "1s2nj2ac30rab3jqcx1iqllwsdcjdawvgq1ps2qh7vlp57fkc0c8",
+  "rev": "d3f3e6ee5d5587cdd9f6ad2b87e12651e78248bc",
+  "date": "2021-09-12T20:52:30+02:00",
+  "path": "/nix/store/djx48kn3pxl45hl6x6v9yy9y88phf9dv-qbar",
+  "sha256": "0zkx8rqgkij7mxfv91igjypal29791nx9fqfrxc93lw02raiyhg2",
+  "fetchLFS": false,
   "fetchSubmodules": false,
   "deepClone": false,
   "leaveDotGit": false