Update GitHub Actions #1635

Job	Run time
build-test-cohttp-eio (ubuntu-latest, 5, http.opam cohttp.opam cohttp-eio.opam )	6m 4s
build-test-default (ubuntu-latest, 4.14, *.opam !cohttp-eio.opam !cohttp-curl-async.opam !cohttp-...	5m 58s
build-test-cohttp-eio (macos-latest, 5, http.opam cohttp.opam cohttp-eio.opam )	7m 19s
build-test-default (ubuntu-latest, 5, *.opam !cohttp-eio.opam !cohttp-curl-async.opam !cohttp-asy...	8m 4s
build-test-cohttp-async (ubuntu-latest, 4.14, *.opam !cohttp-mirage.opam !cohttp-curl-lwt.opam !c...	6m 9s
build-test-default (macos-latest, 4.14, *.opam !cohttp-eio.opam !cohttp-curl-async.opam !cohttp-a...	4m 44s
build-test-cohttp-bench (ubuntu-latest, 5, *.opam )	8m 56s
build-test-default (macos-latest, 5, *.opam !cohttp-eio.opam !cohttp-curl-async.opam !cohttp-asyn...	8m 31s
build-test-cohttp-async (ubuntu-latest, 5, *.opam !cohttp-mirage.opam !cohttp-curl-lwt.opam !coht...	9m 26s
build-test-cohttp-async (macos-latest, 4.14, *.opam !cohttp-mirage.opam !cohttp-curl-lwt.opam !co...	7m 24s
build-test-cohttp-async (macos-latest, 5, *.opam !cohttp-mirage.opam !cohttp-curl-lwt.opam !cohtt...	9m 25s
	1h 22m 0s

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