Merge pull request #559 from rust-lang/ci/major #281

Job	Run time
test (ubuntu-latest, 26.3)	38s
test (ubuntu-latest, 27.2)	36s
test (ubuntu-latest, 28.2)	42s
test (ubuntu-latest, 29.4)	1m 6s
test (macos-latest, 28.2)	2m 12s
test (macos-latest, 29.4)	2m 26s
test (windows-latest, 26.3)	4m 12s
test (windows-latest, 27.2)	2m 12s
test (windows-latest, 28.2)	1m 51s
test (windows-latest, 29.4)	2m 59s
test (ubuntu-latest, snapshot, true)	36s
test (macos-latest, snapshot, true)	2m 16s
test (windows-latest, snapshot, true)	2m 26s
	24m 12s

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