Add psij-python dependency for radical to avoid radical.saga layer

See radical-cybertools/radical.saga#885
which repeatedly recommends avoiding the radical SAGA layer, and
the corresponding Parsl issue #3029

This PR updates the comment for psi-j-parsl in setup.py to reflect
the different between psi-j-parsl and psij-python.

setup.py

@@ -34,8 +34,8 @@
     'workqueue': ['work_queue'],
     'flux': ['pyyaml', 'cffi', 'jsonschema'],
     'proxystore': ['proxystore'],
-    'radical-pilot': ['radical.pilot'],
-    # Disabling psi-j since github direct links are not allowed by pypi
+    'radical-pilot': ['radical.pilot', 'psij-python==0.9.3'],
+    # Disabling psi-j-parsl since github direct links are not allowed by pypi
     # 'psij': ['psi-j-parsl@git+https://github.com/ExaWorks/psi-j-parsl']
 }
 extras_require['all'] = sum(extras_require.values(), [])