timeshift: use `tag`

Changed files
+1 -1
pkgs
applications
backup
timeshift
+1 -1
pkgs/applications/backup/timeshift/unwrapped.nix
···
src = fetchFromGitHub {
owner = "linuxmint";
repo = "timeshift";
-
rev = finalAttrs.version;
+
tag = finalAttrs.version;
hash = "sha256-X3TwUkOeGzcgFM/4Fyfs8eQuGK2wHe3t13WSpIizX8s=";
};