Use `any/c` for the `ip-address-string?` domain
Use `any/c` for the `ip-address-string?` domain

Previously, it was `string?` which is needlessly
restrictive and caused premature contract failures.

Please merge into 5.3.4

original commit: 5735d37794315dd9f6d2dedfdf6cae3a1dc7181b

mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket