Drop support for Python 3.9 #3560

Job	Run time
Test Lint	1m 1s
Make SDist	32s
link_check	3m 37s
test_docs	55s
test_without_debugpy (ubuntu-latest, 3.10)	2m 16s
Test Prereleases	2m 36s
Test Minimum Versions	3m 3s
check_release	1m 39s
build (ubuntu-latest, 3.12)	5m 0s
build (windows-latest, 3.12)	6m 22s
build (windows-latest, pypy-3.10)	6m 33s
build (ubuntu-latest, 3.11)	4m 50s
build (windows-latest, 3.10)	6m 29s
build (macos-latest, 3.12)	4m 30s
build (windows-latest, 3.13)	6m 28s
build (macos-latest, 3.10)	5m 23s
build (windows-latest, 3.11)	6m 9s
build (ubuntu-latest, pypy-3.10)	4m 15s
build (macos-latest, 3.11)	4m 55s
build (macos-latest, 3.13)	5m 9s
build (ubuntu-latest, 3.10)	4m 45s
build (macos-latest, pypy-3.10)	5m 33s
build (ubuntu-latest, 3.13)	4m 50s
Install from SDist and Test	2m 25s
coverage	1s
	1h 39m 16s

Provide feedback