v0.43.9

Patch release with the following fixes/quality of life changes. This being a patch fix, there are no API changes.

What's Changed

• "PyQt6-Qt6!=6.6.0,!=6.7.0" "PyQt6!=6.6.0" to fix PyVistaQt and MNE-Python integration tests by @tkoyama010 #6182
• Temporarily restrict NumPy version in pyproject.toml by @adeak #6210

Full Changelog: v0.43.8...v0.43.9