Python 3.12 No support

[Eranh0]

should work with python 3.10 and greater, but doesn't work with 3.12

`pip3 install abjad
Defaulting to user installation because normal site-packages is not writeable
Collecting abjad
Using cached abjad-3.19.tar.gz (413 kB)
Installing build dependencies ... done
Getting requirements to build wheel ... error
error: subprocess-exited-with-error

× Getting requirements to build wheel did not run successfully.
│ exit code: 1
╰─> [3 lines of output]
This is Abjad 3.19, which supports Python 3.10, 3.11.

  But it looks like you're trying to install Abjad with Python 3.12.
  [end of output]

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

× Getting requirements to build wheel 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.`

[trevorbaca]

That's right: Abjad 3.19 has only been tested with Python 3.10 and 3.11.

I'll test with Python 3.12 when I build Abjad 3.20.