ci: update pypa/cibuildwheel action to v2.21.3

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
pypa/cibuildwheel	action	patch	v2.21.1 -> v2.21.3

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Release Notes

pypa/cibuildwheel (pypa/cibuildwheel)

v2.21.3

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• 🛠 Update CPython 3.13 to 3.13.0 final release (#​2032)
• 📚 Docs updates and tidy ups (#​2035)

v2.21.2

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• ✨ Adds support for building 32-bit armv7l wheels on musllinux. On a Linux system with emulation set up, set CIBW_ARCHS to armv7l to try it out if you're interested! (#​2017)
• 🐛 Fix Linux Podman builds on some systems (#​2016)
• ✨ Adds official support for running on Python 3.13 (#​2026)
• 🛠 Update CPython 3.13 to 3.13.0rc3 (#​2029)

Note: the default manylinux image is scheduled to change from manylinux2014 to manylinux_2_28 in a cibuildwheel release on or after 6th May 2025 - you can set the value now to avoid getting upgraded if you want. (#​1992)

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