Add py-jupyter-server-proxy to spack.yaml

This package enables users to start web servers in JupyterLab and access them, which is useful in rare edge cases like post-processing of viztracer results.
The latest spack package installs py-jupyter-server-proxy v3.2.2.
The current version on pypi is v4.4.0.
https://packages.spack.io/package.html?name=py-jupyter-server-proxy
https://jupyter-server-proxy.readthedocs.io/en/latest/
https://github.com/jupyterhub/jupyter-server-proxy
https://pypi.org/project/jupyter-server-proxy/

packages/py-quantities/package.py

@@ -10,9 +10,10 @@ class PyQuantities(PythonPackage):
     """Support for physical quantities with units, based on numpy"""
 
     homepage = "https://python-quantities.readthedocs.org"
-    pypi = "quantities/quantities-0.16.0.tar.gz"
+    pypi = "quantities/quantities-0.16.2.tar.gz"
     maintainers = ['apdavison']
-    
+
+    version('0.16.2', sha256='1f7c24f10d9ff57ddf751a358ea2fdfa9914516722f06a788ef4a2924c77d21c')
     version('0.16.0', sha256='211cce2d268da7e202abab5c2533ce3200ff619dd8ac2a3cd98f861b8a57c6eb')
     version('0.15.0', sha256='9ea31e2a0d7517cf24d546b14146def9292639993a616cca61b875ef796b4b2b')
     version('0.14.1', sha256='efeafffc0c0364f891a9327239cd12496bccb55cd037a6d1bf44de706f722877')