drop python 3.7 #1377

Job	Run time
lint	39s
build	29s
cleanup_buckets	19s
test-linux-bundle	9m 20s
test (ubuntu-latest, 3.8)	4m 48s
test-windows-bundle (windows-2019)	13m 35s
test-docker	31m 5s
test (ubuntu-latest, 3.9)	4m 57s
test-windows-bundle (windows-latest)	10m 46s
test (ubuntu-latest, 3.10)	5m 7s
test (ubuntu-latest, 3.11)	4m 47s
test (ubuntu-latest, 3.12)	14m 31s
test (ubuntu-latest, pypy3.9)	12m 7s
test (ubuntu-latest, pypy3.10)	30m 39s
test (macos-latest, 3.10)	3m 9s
test (macos-latest, 3.11)	2m 53s
test (macos-latest, 3.12)	10m 25s
test (macos-latest, pypy3.9)	8m 48s
test (windows-latest, 3.8)	5m 28s
test (windows-latest, 3.9)	5m 33s
test (windows-latest, 3.10)	5m 42s
test (windows-latest, 3.11)	5m 51s
test (windows-latest, 3.12)	12m 54s
test (windows-latest, pypy3.9)	18m 32s
test (macos-13, 3.8)	7m 2s
test (macos-13, 3.9)	5m 52s
doc	55s
	3h 56m 13s

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