`pip install mwalib` does not work on Python 3.11

Users will expect that they can pip install mwalib, because it says so in the wiki , however this doesn't work with python 3.11, even though it did on python 3.10 Steps to reproduce:

Create and activate a python3.11 virtualenv
pip install mwalib

message:

Collecting mwalib
  Downloading mwalib-1.1.0.tar.gz (362 kB)
     ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 362.1/362.1 kB 9.0 MB/s eta 0:00:00
  Installing build dependencies ... error
  error: subprocess-exited-with-error

  × pip subprocess to install build dependencies did not run successfully.
  │ exit code: 1
  ╰─> [6 lines of output]
      Collecting setuptools
        Downloading setuptools-68.2.2-py3-none-any.whl.metadata (6.3 kB)
      Collecting wheel
        Downloading wheel-0.41.2-py3-none-any.whl.metadata (2.2 kB)
      ERROR: Could not find a version that satisfies the requirement python_version>=3.7 (from versions: 0.0.2)
      ERROR: No matching distribution found for python_version>=3.7
      [end of output]

  note: This error originates from a subprocess, and is likely not a problem with pip.
error: subprocess-exited-with-error

× pip subprocess to install build dependencies did not run successfully.
│ exit code: 1
╰─> See above for output.

note: This error originates from a subprocess, and is likely not a problem with pip.

I have a feeling this is something to do with these lines in pyproject.toml

[build-system]
requires = ["setuptools", "wheel", "python_version>=3.7"]

It's weird that this works fine on python3.10

MWATelescope / mwalib

`pip install mwalib` does not work on Python 3.11 #63