python311Packages.sip: add poppler-qt5 to passthru.tests

It breaks on sip 6.8.0 with

    NameError: name 'SocstringSignature' is not defined. Did you mean: 'DocstringSignature'?

pkgs/development/python-modules/sip/default.nix

@@ -9,6 +9,7 @@
 , ply
 , toml
 , tomli
+, poppler-qt5
 }:
 
 buildPythonPackage rec {
@@ -36,6 +37,10 @@ buildPythonPackage rec {
 
   pythonImportsCheck = [ "sipbuild" ];
 
+  passthru.tests = {
+    inherit poppler-qt5;
+  };
+
   meta = with lib; {
     description = "Creates C++ bindings for Python modules";
     homepage    = "https://riverbankcomputing.com/";