gha: stop testing using OCaml+AFL variants #1616

Job	Run time
build-test-cohttp-bench (ubuntu-latest, 5.x, *.opam )	7m 20s
build-test-cohttp-async (ubuntu-latest, 4.14, *.opam !cohttp-mirage.opam !cohttp-curl-lwt.opam !c...	6m 10s
build-test-default (ubuntu-latest, 4.14, *.opam !cohttp-eio.opam !cohttp-curl-async.opam !cohttp-...	6m 3s
build-test-cohttp-async (ubuntu-latest, 5.x, *.opam !cohttp-mirage.opam !cohttp-curl-lwt.opam !co...	9m 17s
build-test-cohttp-eio (ubuntu-latest, 5.x, http.opam cohttp.opam cohttp-eio.opam )	4m 26s
build-test-cohttp-async (macos-latest, 4.14, *.opam !cohttp-mirage.opam !cohttp-curl-lwt.opam !co...	4m 49s
build-test-default (ubuntu-latest, 5.x, *.opam !cohttp-eio.opam !cohttp-curl-async.opam !cohttp-a...	8m 34s
build-test-cohttp-eio (macos-latest, 5.x, http.opam cohttp.opam cohttp-eio.opam )	4m 47s
build-test-cohttp-async (macos-latest, 5.x, *.opam !cohttp-mirage.opam !cohttp-curl-lwt.opam !coh...	6m 57s
build-test-default (macos-latest, 4.14, *.opam !cohttp-eio.opam !cohttp-curl-async.opam !cohttp-a...	4m 24s
build-test-default (macos-latest, 5.x, *.opam !cohttp-eio.opam !cohttp-curl-async.opam !cohttp-as...	6m 15s
	1h 9m 2s

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