add pyproject.toml, require Python 3.10, JupyterHub 3 #153
+50
−64
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needed before
pip installstarts failingdrops Python 3.9, JupyterHub 2 support
otherwise, should be no changes
black, pyupgrade config no longer needed, as project.requires-python is used instead
fixes recent ci failures in #152, #151 which test an OS no longer supported by GHA