pdfding: fix build

Not-cherry-picked-because: build failure is only on 26.05
Signed-off-by: phanirithvij <phanirithvij2000@gmail.com>

Author: phanirithvij

pkgs/by-name/pd/pdfding/package.nix

@@ -132,6 +132,7 @@ python.pkgs.buildPythonPackage (finalAttrs: {
   '';
 
   pythonRelaxDeps = [
+    "django"
     "django-allauth"
     "gunicorn"
     "huey"