build

Update GitHub Actions (#409) #461

Job	Run time
build (ubuntu-latest, ., true, 5.x)	8m 46s
build (ubuntu-latest, ., true, 4.14)	7m 53s
build (macos-latest, 4.14, ., true)	9m 7s
build (windows-latest, 4.14, alcotest alcotest-js alcotest-lwt alcotest-mirage, false, alcotest.o...	13m 19s
build (ubuntu-latest, 4.08, alcotest alcotest-js alcotest-lwt alcotest-mirage, false, alcotest.op...	5m 40s
build (ubuntu-latest, 4.09, alcotest alcotest-js alcotest-lwt alcotest-mirage, false, alcotest.op...	5m 52s
build (ubuntu-latest, 4.10, alcotest alcotest-js alcotest-lwt alcotest-mirage, false, alcotest.op...	5m 32s
build (ubuntu-latest, 4.11, alcotest alcotest-js alcotest-lwt alcotest-mirage, false, alcotest.op...	6m 2s
build (ubuntu-latest, 4.12, alcotest alcotest-js alcotest-lwt alcotest-mirage, false, alcotest.op...	5m 29s
build (ubuntu-latest, 4.13, alcotest alcotest-js alcotest-lwt alcotest-mirage, false, alcotest.op...	5m 0s
	1h 12m 40s

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