Exclude jupyter_packaging=0.12

Author: IsabelParedes

pyproject.toml

@@ -1,5 +1,5 @@
 [build-system]
-requires = ["jupyter_packaging~=0.10,<0.12", "jupyterlab>=3,<4"]
+requires = ["jupyter_packaging~=0.10,!=0.12,<2", "jupyterlab>=3,<4"]
 build-backend = "jupyter_packaging.build_api"
 
 [tool.jupyter-packaging.options]