Add support for pytest 9 and drop Python 3.9 support #2593

Job	Run time
Build package	31s
Run linters	1m 11s
ubuntu - Python 3.11	1m 11s
ubuntu - Python 3.10	2m 8s
ubuntu - Python 3.13	1m 24s
ubuntu - Python 3.14t	1m 41s
ubuntu - Python 3.14	1m 14s
ubuntu - Python 3.12	1m 27s
windows - Python 3.10	3m 18s
windows - Python 3.14	2m 23s
windows - Python 3.12	2m 19s
windows - Python 3.11	2m 26s
Lint GitHub Actions / 🔐 Analyze repo with zizmor 🌈	15s
windows - Python 3.14t	3m 35s
windows - Python 3.13	2m 28s
Check	12s
Create GitHub release	41s
Publish packages to pypi.org	-1s
Publish packages to test.pypi.org	-1s
	28m 22s

Provide feedback