Support IPV6 in _find_http_port()

[schnell18]

When I try to deploy the jupyterlab server in an environment with IPV6 address, the server fail to start with stack trace like:

Traceback (most recent call last):
  File "/opt/conda/bin/jupyter-lab", line 10, in <module>
    sys.exit(main())
  File "/opt/conda/lib/python3.10/site-packages/jupyter_server/extension/application.py", line 607, in launch_instance
    serverapp = cls.initialize_server(argv=args)
  File "/opt/conda/lib/python3.10/site-packages/jupyter_server/extension/application.py", line 577, in initialize_server
    serverapp.initialize(
  File "/opt/conda/lib/python3.10/site-packages/traitlets/config/application.py", line 113, in inner
    return method(app, *args, **kwargs)
  File "/opt/conda/lib/python3.10/site-packages/jupyter_server/serverapp.py", line 2550, in initialize
    self.init_httpserver()
  File "/opt/conda/lib/python3.10/site-packages/jupyter_server/serverapp.py", line 2371, in init_httpserver
    self._find_http_port()
  File "/opt/conda/lib/python3.10/site-packages/jupyter_server/serverapp.py", line 2419, in _find_http_port
    tmp_sock.bind((self.ip, port))
socket.gaierror: [Errno -9] Address family for hostname not supported

This pull request is to solve the problem by detect if the address to listen to is an IPV6 address, if so it construct a socket object with family set to AF_INET6. Otherwise, it fails back to the original code path.

Please consider accepting this patch to make user on IPV6 happier.
Thanks for your attention!

[codecov]

Codecov Report

Base: 80.33% // Head: 80.44% // Increases project coverage by +0.11% 🎉

Coverage data is based on head (27984a8) compared to base (0111798).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1207      +/-   ##
==========================================
+ Coverage   80.33%   80.44%   +0.11%     
==========================================
  Files          68       68              
  Lines        8116     8117       +1     
  Branches     1581     1581              
==========================================
+ Hits         6520     6530      +10     
+ Misses       1180     1174       -6     
+ Partials      416      413       -3     

Impacted Files	Coverage Δ
jupyter_server/serverapp.py	80.05% <100.00%> (+0.10%)	⬆️
jupyter_server/gateway/managers.py	83.60% <0.00%> (+0.23%)	⬆️
...ter_server/services/kernels/connection/channels.py	61.06% <0.00%> (+1.32%)	⬆️
jupyter_server/extension/handler.py	69.23% <0.00%> (+1.53%)	⬆️

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[blink1073]

Thank you!

[welcome]

Congrats on your first merged pull request in this project! 🎉

Thank you for contributing, we are very proud of you! ❤️

[blink1073]

Thanks! The failure is unrelated.