Update from idn11 to idn2

[lolgab]

idn11 is not present in vcpkg's repository, which is one of the ways to static link applications with Scala Native using https://github.com/indoorvivants/sbt-vcpkg
Since idn2 is present and it's the newest version of the library, this PR updates sttp.model.internal.idn.CIdn to use idn2

[keynmol]

To add to this, idn1 and idn2 are not compatible, even such small usage as STTP model triggers a conflict:

[error] Undefined symbols for architecture arm64:
[error]   "_idn_free", referenced from:
[error]       __SM31sttp.model.internal.idn.IdnApi$D18toAscii$$anonfun$1L16java.lang.StringL29scala.scalanative.unsafe.ZoneL16java.lang.StringEPT31sttp.model.internal.idn.IdnApi$ in 3.ll.o
[error]   "_idna_strerror", referenced from:
[error]       __SM31sttp.model.internal.idn.IdnApi$D18toAscii$$anonfun$1L16java.lang.StringL29scala.scalanative.unsafe.ZoneL16java.lang.StringEPT31sttp.model.internal.idn.IdnApi$ in 3.ll.o
[error]   "_idna_to_ascii_8z", referenced from:
[error]       __SM31sttp.model.internal.idn.IdnApi$D18toAscii$$anonfun$1L16java.lang.StringL29scala.scalanative.unsafe.ZoneL16java.lang.StringEPT31sttp.model.internal.idn.IdnApi$ in 3.ll.o
[error] ld: symbol(s) not found for architecture arm64

So you can't just substitute one for another at link time.

[lolgab]

Can we have a release with this?
It would be great since it blocks the first Tapir Scala Native application in the world :)

[adamw]

@lolgab Yes released here: https://github.com/softwaremill/sttp-model/releases/tag/v1.5.2 :)