Add support for prebuild armv7l #788

msgspec is resource-efficient and therefore predestined for "small setups" (architectures) / it would be nice if we had the pre-builds for such architectures ..

https://github.com/jcrist/msgspec/blob/dd965dce22e5278d4935bea923441ecde31b5325/.github/workflows/ci.yml#L86

About armv7l

• https://cibuildwheel.pypa.io/en/stable/changelog/#v2212
• https://cibuildwheel.pypa.io/en/stable/options/#archs