Drop support for Python 3.9 #3561

Job	Run time
Test Lint	1m 3s
check_release	1m 49s
test_docs	46s
link_check	3m 42s
build (ubuntu-latest, 3.11)	4m 56s
build (ubuntu-latest, 3.12)	5m 8s
Test Prereleases	2m 33s
build (ubuntu-latest, 3.10)	4m 51s
build (ubuntu-latest, pypy-3.10)	4m 23s
build (ubuntu-latest, 3.13)	5m 9s
build (windows-latest, pypy-3.10)	7m 17s
build (windows-latest, 3.13)	6m 44s
build (windows-latest, 3.11)	8m 32s
build (windows-latest, 3.10)	7m 12s
build (macos-latest, 3.11)	4m 42s
test_without_debugpy (ubuntu-latest, 3.10)	2m 24s
Test Minimum Versions	2m 47s
build (macos-latest, 3.12)	5m 22s
build (windows-latest, 3.12)	6m 31s
Make SDist	25s
build (macos-latest, 3.13)	5m 4s
build (macos-latest, 3.10)	5m 36s
build (macos-latest, pypy-3.10)	4m 35s
Install from SDist and Test	2m 41s
coverage	16s
	1h 44m 28s

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