Remove Python 3.7's special ephemeral server kill #905

Job	Run time
build-lint-test (3.8, ubuntu-latest)	8m 28s
build-lint-test (3.8, ubuntu-arm)	6m 12s
build-lint-test (3.8, macos-intel)	10m 58s
build-lint-test (3.8, windows-latest)	9m 45s
build-lint-test (3.12, ubuntu-latest)	9m 0s
build-lint-test (3.12, ubuntu-arm)	6m 20s
build-lint-test (3.12, macos-intel)	11m 16s
build-lint-test (3.12, macos-arm)	3m 47s
build-lint-test (3.12, windows-latest)	9m 53s
features-tests / test	5m 38s
	1h 21m 17s

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