Drop support for Python 3.9 #3562

Job	Run time
Test Lint	1m 7s
Make SDist	34s
Test Prereleases	2m 44s
check_release	2m 0s
Test Minimum Versions	2m 47s
build (ubuntu-latest, 3.10)	4m 53s
test_docs	53s
link_check	3m 44s
build (windows-latest, 3.10)	6m 29s
build (windows-latest, 3.13)	6m 45s
build (ubuntu-latest, pypy-3.10)	4m 29s
build (ubuntu-latest, 3.12)	4m 57s
test_without_debugpy (ubuntu-latest, 3.10)	2m 20s
build (windows-latest, 3.11)	7m 11s
build (macos-latest, 3.13)	5m 27s
build (windows-latest, pypy-3.10)	7m 43s
build (ubuntu-latest, 3.13)	4m 50s
build (macos-latest, 3.11)	5m 32s
build (macos-latest, 3.12)	4m 51s
build (windows-latest, 3.12)	7m 7s
build (macos-latest, pypy-3.10)	5m 6s
build (ubuntu-latest, 3.11)	4m 49s
build (macos-latest, 3.10)	4m 49s
Install from SDist and Test	2m 21s
coverage	12s
	1h 43m 40s

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