disable insecure #4

Job	Run time
build-test-cohttp-bench (ubuntu-latest, 5, *.opam )	5m 25s
build-test-default (ubuntu-latest, 5, *.opam !cohttp-eio.opam !cohttp-curl-async.opam !cohttp-asy...	5m 26s
build-test-cohttp-eio (ubuntu-latest, 5, http.opam cohttp.opam cohttp-eio.opam )	2m 29s
build-test-cohttp-async (ubuntu-latest, 5, *.opam !cohttp-mirage.opam !cohttp-curl-lwt.opam !coht...	6m 43s
build-test-default (macos-latest, 5, *.opam !cohttp-eio.opam !cohttp-curl-async.opam !cohttp-asyn...	4m 24s
build-test-cohttp-eio (macos-latest, 5, http.opam cohttp.opam cohttp-eio.opam )	4m 24s
build-test-cohttp-async (macos-latest, 5, *.opam !cohttp-mirage.opam !cohttp-curl-lwt.opam !cohtt...	6m 1s
	34m 52s

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