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Prevent ip2locationio from building with dune 3.13

Dune 3.13 introduces an additional check for the validity of the package
names for opam dependencies thus `lwt.unix` is flagged as invalid.
`lwt.unix` does not make much sense as an OPAM package as it is a
findlib name and available in the `lwt` package.

PR with fix upstream submitted: https://github.com/ip2location/ip2location-io-ocaml/pull/2

Example of failing build:
https://opam.ci.ocaml.org/github/ocaml/opam-repository/commit/fa3e075e57439140df4aacda519ec59df15e0b66/variant/compilers,4.14,dune-configurator.3.13.0~alpha1,revdeps,ip2locationio.1.0.0

Changed files
+1 -1
packages
ip2locationio
ip2locationio.1.0.0
+1 -1
packages/ip2locationio/ip2locationio.1.0.0/opam
···
bug-reports: "https://github.com/ip2location/ip2location-io-ocaml/issues"
depends: [
"ocaml" {>= "4.13"}
-
"dune" {>= "3.4"}
"lwt"
"cohttp"
"cohttp-lwt-unix"
···
bug-reports: "https://github.com/ip2location/ip2location-io-ocaml/issues"
depends: [
"ocaml" {>= "4.13"}
+
"dune" {>= "3.4" & < "3.13"}
"lwt"
"cohttp"
"cohttp-lwt-unix"