timeshift: 24.06.6 -> 25.07.4

https://github.com/linuxmint/timeshift/compare/24.06.6...25.07.4

The timeshift-launcher substitution upstreamed:
https://github.com/linuxmint/timeshift/commit/98af1049992693599be78528029abba5421c4f19

run-parts introduced in:
https://github.com/linuxmint/timeshift/commit/b20c307d455a04df3d8bcd2cf9eee01c26b5b999

pkgs/applications/backup/timeshift/default.nix

···
   btrfs-progs,
   coreutils,
   cron,
+  debianutils,
   grubPackage,
   mount,
   psmisc,
···
   btrfs-progs
   coreutils
   cron
+  debianutils
   grubPackage
   mount
   psmisc

pkgs/applications/backup/timeshift/unwrapped.nix

···
 
 stdenv.mkDerivation rec {
   pname = "timeshift";
-  version = "24.06.6";
+  version = "25.07.4";
 
   src = fetchFromGitHub {
     owner = "linuxmint";
     repo = "timeshift";
     rev = version;
-    hash = "sha256-umMekxP9bvV01KzfIh2Zxa9Xb+tR5x+tG9dOnBIOkjY=";
+    hash = "sha256-yrLpEhSt7QB0qWCXjIjTVeXKRpgue2pVdV+6hSixeuA=";
   };
 
   postPatch = ''
···
       --replace-fail "/usr/share" "$out/share"
 
     # Substitute app_command to look for the `timeshift-gtk` in $out.
-    # Substitute the `pkexec ...` as a hack to run a GUI application like Timeshift as root without setting up the corresponding pkexec policy.
     substituteInPlace ./src/timeshift-launcher \
-      --replace-fail "app_command='timeshift-gtk'" "app_command=$out/bin/timeshift-gtk" \
-      --replace-fail ${lib.escapeShellArg ''pkexec ''${app_command}''} ${lib.escapeShellArg ''pkexec env DISPLAY="$DISPLAY" XAUTHORITY="$XAUTHORITY" "''${app_command}"''}
+      --replace-fail "app_command='timeshift-gtk'" "app_command=$out/bin/timeshift-gtk"
   '';
 
   nativeBuildInputs = [