This package will soon be part of the auto-icu transition. You might want to ensure that your package is ready for it.
You can probably find supplementary information in the
debian-release
archives or in the corresponding
release.debian.org
bug.
Migration status for haskell-idna (0.3.0-12 to 0.3.0-13): BLOCKED: Cannot migrate due to another item, which is blocked (please check which dependencies are stuck)