build

Remove Python 3.9 port #73

Job	Run time
test (macos-latest, 3.9, py39)	21s
test (macos-latest, 3.10, py310)	18s
test (macos-latest, 3.11, py311)	17s
test (macos-latest, 3.12, py312)	20s
test (macos-latest, pypy3.9, pypy39)	38s
test (macos-latest, pypy3.10, pypy310)	1m 7s
test (windows-latest, 3.9, py39)	44s
test (windows-latest, 3.10, py310)	35s
test (windows-latest, 3.11, py311)	42s
test (windows-latest, 3.12, py312)	57s
test (windows-latest, pypy3.9, pypy39)	1m 41s
test (windows-latest, pypy3.10, pypy310)	2m 6s
test (ubuntu-latest, 3.9, py39)	17s
test (ubuntu-latest, 3.10, py310)	17s
test (ubuntu-latest, 3.11, py311)	13s
test (ubuntu-latest, 3.12, py312)	17s
test (ubuntu-latest, pypy3.9, pypy39)	36s
test (ubuntu-latest, pypy3.10, pypy310)	39s
test (ubuntu-latest, 3.9, codestyle)	11s
test (ubuntu-latest, 3.9, lint)	10s
test (ubuntu-latest, 3.9, typecheck)	16s
	12m 42s

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