feat: add Python 3.12 beta 1 (#1507)

* feat: add Python 3.12 beta 1

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

* fix: try updating some versions to (near) final 3.6 supported version

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

* tests: skip dep check on 3.6

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

* Update test pip version pin

* Fix expected wheels check

---------

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>
Co-authored-by: Joe Rickerby <joerick@mac.com>

README.md

@@ -31,6 +31,7 @@ What does it do?
 | CPython 3.9   | ✅ | ✅  | ✅  | ✅  | ✅² | ✅³ | ✅ | ✅ | ✅  | ✅  |
 | CPython 3.10  | ✅ | ✅  | ✅  | ✅  | ✅² | ✅ | ✅  | ✅ | ✅  | ✅  |
 | CPython 3.11  | ✅ | ✅  | ✅  | ✅  | ✅² | ✅ | ✅  | ✅ | ✅  | ✅  |
+| CPython 3.12⁵ | ✅ | ✅  | ✅  | ✅  | ✅² | ✅ | ✅  | ✅ | ✅  | ✅  |
 | PyPy 3.7 v7.3 | ✅ | N/A | ✅  | N/A | N/A | ✅¹ | ✅¹  | ✅¹ | N/A | N/A |
 | PyPy 3.8 v7.3 | ✅ | ✅⁴ | ✅  | N/A | N/A | ✅¹ | ✅¹  | ✅¹ | N/A | N/A |
 | PyPy 3.9 v7.3 | ✅ | ✅⁴ | ✅  | N/A | N/A | ✅¹ | ✅¹  | ✅¹ | N/A | N/A |
@@ -39,6 +40,7 @@ What does it do?
 <sup>² Windows arm64 support is experimental.</sup><br>
 <sup>³ Alpine 3.14 and very briefly 3.15's default python3 [was not able to load](https://github.com/pypa/cibuildwheel/issues/934) musllinux wheels. This has been fixed; please upgrade the python package if using Alpine from before the fix.</sup><br>
 <sup>⁴ Cross-compilation not supported with PyPy - to build these wheels you need to run cibuildwheel on an Apple Silicon machine.</sup><br>
+<sup>⁵ CPython 3.12 is available using the [CIBW_PRERELEASE_PYTHONS](https://cibuildwheel.readthedocs.io/en/stable/options/#prerelease-pythons) option.</sup><br>
 
 - Builds manylinux, musllinux, macOS 10.9+, and Windows wheels for CPython and PyPy
 - Works on GitHub Actions, Azure Pipelines, Travis CI, AppVeyor, CircleCI, GitLab CI, and Cirrus CI