backintime-common: Add dependency on fuse3 (#531622)

pkgs/by-name/ba/backintime-common/package.nix

@@ -9,6 +9,7 @@
   cron,
   openssh,
   sshfs-fuse,
+  fuse3,
   gocryptfs,
   which,
   ps,
@@ -73,11 +74,14 @@ stdenv.mkDerivation (finalAttrs: {
       --replace-fail "share" "${python'.sitePackages}"
 
     substituteInPlace "schedule.py" \
-      --replace-fail "'crontab'" "'${cron}/bin/crontab'" \
+      --replace-fail "'crontab'" "'${lib.getExe' cron "crontab"}'" \
       --replace-fail "'which'" "'${lib.getExe which}'" \
       --replace-fail "'ps'" "'${lib.getExe ps}'" \
       --replace-fail "'grep'" "'${lib.getExe gnugrep}'" \
 
+    substituteInPlace mount.py \
+      --replace-fail "'fusermount'" "'${lib.getExe' fuse3 "fusermount3"}'"
+
     substituteInPlace "bitlicense.py" \
       --replace-fail "/usr/share/doc" "$out/share/doc" \
   '';