chore(nix): update flakes #2

Job	Run time
build-test-cohttp-bench (ubuntu-latest, 5, *.opam )	9m 31s
build-test-cohttp-async (ubuntu-latest, 5, *.opam !cohttp-mirage.opam !cohttp-curl-lwt.opam !coht...	10m 51s
build-test-cohttp-eio (ubuntu-latest, 5, http.opam cohttp.opam cohttp-eio.opam )	6m 19s
build-test-default (ubuntu-latest, 5, *.opam !cohttp-eio.opam !cohttp-curl-async.opam !cohttp-asy...	8m 33s
build-test-cohttp-async (macos-latest, 5, *.opam !cohttp-mirage.opam !cohttp-curl-lwt.opam !cohtt...	8m 38s
build-test-cohttp-eio (macos-latest, 5, http.opam cohttp.opam cohttp-eio.opam )	8m 39s
build-test-default (macos-latest, 5, *.opam !cohttp-eio.opam !cohttp-curl-async.opam !cohttp-asyn...	4m 44s
	57m 15s

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