uuu: fix passthru.updateScript version's regex to proper match the version (#369752)

pkgs/by-name/uu/uuu/package.nix

···
   passthru.updateScript = nix-update-script {
     extraArgs = [
       "--version-regex"
-      "uuu_\\([0-9.]+\\)"
+      "uuu_([0-9.]+)"
     ];
   };