v0.6.4

Maintenance. numpy >2 support and Python now between 3.9 and 3.12

What's Changed

• GitHub Actions + py3.12 + musllinux by @sdrobert in #17
• 3.13, drop 3.7 and 3.8, deprecations by @sdrobert in #18
• Add .readthedocs.yaml by @sdrobert in #19

Full Changelog: v0.6.3...v0.6.4