Tests

Bump min Python to 3.9 (#253) #703

Job	Run time
base_setup_minimum	41s
base_setup_pre	33s
base_setup (ubuntu-latest, 3.9)	20s
binder_link	18s
base_setup (ubuntu-latest, 3.12)	22s
check_links	1m 33s
base_setup (windows-latest, 3.9)	57s
base_setup (windows-latest, 3.12)	1m 15s
downstream_defaults	50s
Test coverage (ubuntu-latest)	25s
base_setup (macos-latest, 3.9)	34s
downstream_overrides	1m 58s
Test coverage (windows-latest)	1m 14s
base_setup (macos-latest, 3.12)	18s
Make SDist	1m 26s
base_setup (ubuntu-latest, 3.13)	32s
pr_script	23s
Test Lint	44s
update_snapshots	1m 24s
update_snapshots-manual-server	1m 29s
Combine & check coverage	14s
Install from SDist and Test	25s
tests_check	2s
	17m 57s

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