tools: fix linter when permittedInsecurePackages is empty

Signed-off-by: Antoine du Hamel <duhamelantoine1995@gmail.com>
PR-URL: #65226
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

Author: aduh95

tools/dep_updaters/update-nixpkgs-pin.sh

@@ -81,7 +81,7 @@ nix-instantiate -I "nixpkgs=$NIXPKGS_PIN_FILE" --eval --strict --json -E "
   }
 " | jq -r '"{
   pkgs ? import ./pkgs.nix {
-    config.permittedInsecurePackages = [ \(.permittedInsecurePackages | map(@json) | join(" ")) ];
+    config.permittedInsecurePackages = [ \(.permittedInsecurePackages | if length > 0 then "\(map(@json) | join(" ")) " else "" end)];
   },
 }: