Cibuildwheel

- 🌟 Adds support for cross-compiling Windows ARM64 wheels. To use this feature, add `ARM64` to the [CIBW_ARCHS](https://cibuildwheel.readthedocs.io/en/stable/options/#archs) option on a Windows Intel runner. (1144)
- ✨ Adds support for building Linux aarch64 wheels on Circle CI. (1307)
- ✨ Adds support for building Windows wheels on Gitlab CI. (1295)
- ✨ Adds support for building Linux aarch64 wheels under emulation on Gitlab CI. (1295)
- ✨ Adds the ability to test `cp38-macosx_arm64` wheels on a native arm64 runner. To do this, you'll need to preinstall the (experimental) [universal2 version of CPython 3.8](https://www.python.org/ftp/python/3.8.10/python-3.8.10-macos11.pkg) on your arm64 runner before invoking cibuildwheel. Note: it is not recommended to build x86_64 wheels with this setup, your wheels will have limited compatibility wrt macOS versions. (#1283)
- 🛠 Improved error messages when using custom Docker images and Python cannot be found at the correct path. (1298)
- 📚 Sample configs for Azure Pipelines and Travis CI updated (1296)
- 📚 Other docs improvements - including more information about using Homebrew for build dependencies (1290)

- 🐛 Fix a bug that caused `win32` identifiers to fail when used with `--only`. (1282)
- 🐛 Fix computation of `auto`/`auto64`/`auto32` archs when targeting a different platform to the one that you're running cibuildwheel on. (1266)
- 📚 Fix an mistake in the 'how it works' diagram. (1274)

- 🐛 Fix a bug that stopped environment variables specified in TOML from being expanded. (1273)

- 🌟 Adds support for [building wheels on Cirrus CI](https://cibuildwheel.readthedocs.io/en/stable/setup/#cirrus-ci). This is exciting for us, as it's the first public CI platform that natively supports macOS Apple Silicon (aka. M1, `arm64`) runners. As such, it's the first platform that you can natively build _and test_ macOS `arm64` wheels. It also has native Linux ARM (aarch64) runners, for fast, native builds there. (1191)
- 🌟 Adds support for running cibuildwheel on Apple Silicon machines. For a while, we've supported cross-compilation of Apple Silicon wheels on `x86_64`, but now that we have Cirrus CI we can run our test suite and officially support running cibuildwheel on `arm64`. (1191)
- ✨ Adds the `--only` [command line option](https://cibuildwheel.readthedocs.io/en/stable/options/#command-line), to specify a single build to run. Previously, it could be cumbersome to set all the build selection options to target a specific build - for example, you might have to run something like `CIBW_BUILD=cp39-manylinux_x86_64 cibuildwheel --platform linux --archs x86_64`. The new `--only` option overrides all the build selection options to simplify running a single build, which now looks like `cibuildwheel --only cp39-manylinux_x86_64`. (1098)
- ✨ Adds the [`CIBW_CONFIG_SETTINGS`](https://cibuildwheel.readthedocs.io/en/stable/options/#config-settings) option, so you can pass arguments to your package's build backend (1244)
- 🛠 Updates the CPython 3.11 version to the latest release candidate - v3.11.0rc2. (1265)
- 🐛 Fix a bug that can cause a RecursionError on Windows when building from an sdist. (1253)
- 🛠 Add support for the s390x architecture on manylinux_2_28 (1255)

- 🌟 CPython 3.11 wheels are now built by default - without the CIBW_PRERELEASE_PYTHONS flag. It's time to build and upload these wheels to PyPI! This release includes CPython 3.11.0rc1, which is guaranteed to be ABI compatible with the final release. (1226)
- ⚠️ Removed support for running cibuildwheel in Python 3.6. Python 3.6 is EOL. However, cibuildwheel continues to build CPython 3.6 wheels for the moment. (1175)
- ✨ Improved error messages when misspelling TOML options, suggesting close matches (1205)
- 🛠 When running on Apple Silicon (so far, an unsupported mode of operation), cibuildwheel no longer builds universal2 wheels by default - just arm64. See [1204](https://github.com/pypa/cibuildwheel/issues/1204) for discussion. We hope to release official support for native builds on Apple Silicon soon! (#1217)

- 🐛 Fix a bug when building CPython 3.8 wheels on an Apple Silicon machine where testing would always fail. cibuildwheel will no longer attempt to test the arm64 part of CPython 3.8 wheels because we use the x86_64 installer of CPython 3.8 due to its macOS system version backward-compatibility. See [1169](https://github.com/pypa/cibuildwheel/pull/1169) for more details. (#1171)
- 🛠 Update the prerelease CPython 3.11 to 3.11.0b4. (1180)
- 🛠 The GitHub Action will ensure a compatible version of Python is installed on the runner (1114)
- 📚 A few docs improvements