test

Don't double-interrupt the test HTTP server #525

Job	Run time
ruby-versions / Generate Ruby versions	2s
test (2.6 / ubuntu-latest)	35s
test (2.6 / macos-latest)	49s
test (2.6 / windows-latest)	2m 28s
test (2.7 / ubuntu-latest)	35s
test (2.7 / macos-latest)	38s
test (2.7 / windows-latest)	3m 5s
test (3.0 / ubuntu-latest)	20s
test (3.0 / macos-latest)	23s
test (3.0 / windows-latest)	2m 7s
test (3.1 / ubuntu-latest)	24s
test (3.1 / macos-latest)	24s
test (3.1 / windows-latest)	1m 50s
test (3.2 / ubuntu-latest)	26s
test (3.2 / macos-latest)	24s
test (3.2 / windows-latest)	2m 13s
test (3.3 / ubuntu-latest)	21s
test (3.3 / macos-latest)	26s
test (3.3 / windows-latest)	2m 2s
test (head / ubuntu-latest)	21s
test (head / macos-latest)	24s
test (head / windows-latest)	1m 14s
	21m 31s

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