Crystal URI must be correctly working with IPv6.

[MrSorcus]

require "http"

uri = URI.parse "http://[::1]"

pp HTTP::Client.get(uri)

HTTP::Client.get(uri) # => No address found for [::1]:80 over TCP (Socket::Error)
0x49a987: *CallStack::unwind:Array(Pointer(Void)) at ??
0x5ac449: initialize at /tmp/crystal-0.23.1-3/src/socket/tcp_socket.cr 104:33
0x5abe24: new at /tmp/crystal-0.23.1-3/src/socket/tcp_socket.cr 27:3
0x5a9df9: socket at /tmp/crystal-0.23.1-3/src/http/client.cr 652:5
0x5a9c0d: exec_internal_single at /tmp/crystal-0.23.1-3/src/http/client.cr 500:5
0x5a5eac: exec_internal at /tmp/crystal-0.23.1-3/src/http/client.cr 486:5
0x5a5d92: exec at /tmp/crystal-0.23.1-3/src/http/client.cr 483:5
0x5a5ad6: exec at /tmp/crystal-0.23.1-3/src/http/client.cr 586:5
0x5a5486: exec at /tmp/crystal-0.23.1-3/src/http/client.cr 612:7
0x5a527d: get at /tmp/crystal-0.23.1-3/src/http/client.cr 329:3
0x483326: __crystal_main at /tmp/client.cr 13:1
0x492f79: main at /tmp/crystal-0.23.1-3/src/main.cr 12:15
0x7f0c3c7c7c05: __libc_start_main at ??
0x48295d: ??? at ??
0x0: ??? at ??

#5326 (comment)