Can't install deephaven-core on Python 3.11

[devinrsmith]

deephaven-core can't currently be installed on Python 3.11 due to the following error:

$ pip install deephaven-core
Collecting deephaven-core
  Using cached deephaven_core-0.18.0-py3-none-any.whl (105 kB)
Collecting jpy>=0.12.0
  Using cached jpy-0.13.0-cp311-cp311-manylinux_2_17_x86_64.manylinux2014_x86_64.whl (344 kB)
Collecting deephaven-plugin
  Using cached deephaven_plugin-0.3.0-py3-none-any.whl (8.5 kB)
Collecting numpy
  Using cached numpy-1.23.4-cp311-cp311-manylinux_2_17_x86_64.manylinux2014_x86_64.whl (17.1 MB)
Collecting pandas
  Using cached pandas-1.5.1-cp311-cp311-manylinux_2_17_x86_64.manylinux2014_x86_64.whl (12.0 MB)
Collecting numba
  Using cached numba-0.56.4.tar.gz (2.4 MB)
  Preparing metadata (setup.py) ... error
  error: subprocess-exited-with-error
  
  × python setup.py egg_info did not run successfully.
  │ exit code: 1
  ╰─> [8 lines of output]
      Traceback (most recent call last):
        File "<string>", line 2, in <module>
        File "<pip-setuptools-caller>", line 34, in <module>
        File "/tmp/pip-install-qcjzmnyi/numba_af4f93a35e374f3a9575409510fed843/setup.py", line 51, in <module>
          _guard_py_ver()
        File "/tmp/pip-install-qcjzmnyi/numba_af4f93a35e374f3a9575409510fed843/setup.py", line 48, in _guard_py_ver
          raise RuntimeError(msg.format(cur_py, min_py, max_py))
      RuntimeError: Cannot install on Python version 3.11.0; only versions >=3.7,<3.11 are supported.
      [end of output]
  
  note: This error originates from a subprocess, and is likely not a problem with pip.
error: metadata-generation-failed

× Encountered error while generating package metadata.
╰─> See above for output.

note: This is an issue with the package mentioned above, not pip.
hint: See above for details.

This appears to be an issue with our dependency on numba, which doesn't have Python 3.11 support yet, see numba/numba#8304.