std.Io.net: fix off-by-one in HostName.expand

`HostName.expand` was including the null terminator in the slice passed to `HostName.init`, which caused `HostName.validate` to fail.
2e6f7d36b90x4a61636f62 committed on 11/14/2025, 5:04:21 AM· committed by Ryan Liptakparent813e861
2 files changedLine totals unavailable