opam: add bound on jbuilder in tcpip
opam: add bound on jbuilder in tcpip

See https://github.com/ocaml/opam-repository/pull/11515

Signed-off-by: David Scott <63c9eb0ea83039690fefa11afe17873ba8278a56@docker.com>

djs55/vpnkit,djs55/vpnkit,djs55/vpnkit