python.pkgs.jsonpickle: add missing dependency

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

@@ -4,6 +4,7 @@
 , pytest
 , setuptools_scm
 , toml
+, importlib-metadata
 }:
 
 buildPythonPackage rec {
@@ -22,6 +23,10 @@ buildPythonPackage rec {
     toml
   ];
 
+  propagatedBuildInputs = [
+    importlib-metadata
+  ];
+
   checkPhase = ''
     rm pytest.ini
     pytest tests/jsonpickle_test.py