feat: remove Python 3.7 support #239

Job	Run time
38 on aarch64	22m 45s
* auto64 on macos-13	21m 9s
Build SDist	14s
39 on aarch64	23m 20s
* auto64 on macos-14	12m 33s
310 on aarch64	21m 56s
cp* auto64 on windows-2019	15m 47s
311 on aarch64	22m 41s
pp* auto64 on windows-2019	5m 45s
312 on aarch64	23m 51s
* auto32 on windows-2019	15m 46s
313 on aarch64	23m 30s
manylinux auto64 on ubuntu-latest	21m 0s
musllinux auto64 on ubuntu-latest	20m 0s
313t on aarch64	23m 27s
Upload if release	0s
	4h 33m 44s

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