Loosen pin on jupyter-packaging

setup.py

@@ -146,7 +146,7 @@ setup_args['install_requires'] = [
     'packaging',
     'tornado>=6.1.0',
     'jupyter_core',
-    'jupyter_packaging~=0.7.3',
+    'jupyter_packaging~=0.7',
     'jupyterlab_server~=2.3',
     'jupyter_server~=1.4',
     'nbclassic~=0.2',