Add Python 3.12

[messense]

Part of PyO3/maturin#1627

[messense]

bors try amd64 --platform musllinux_1_2

[bors]

try

Build failed:

• conclusion

[messense]

bors retry

[bors]

try

Build failed:

• conclusion

[messense]

bors retry

[bors]

try

Build succeeded!

The publicly hosted instance of bors-ng is deprecated and will go away soon.

If you want to self-host your own instance, instructions are here.
For more help, visit the forum.

If you want to switch to GitHub's built-in merge queue, visit their help page.

• conclusion

[messense]

bors try amd64

[bors]

try

Build failed:

• conclusion

[messense]

bors try arm64

[bors]

try

Build succeeded!

The publicly hosted instance of bors-ng is deprecated and will go away soon.

If you want to self-host your own instance, instructions are here.
For more help, visit the forum.

If you want to switch to GitHub's built-in merge queue, visit their help page.

• conclusion