http3: SNI should not be set if host is literal IP address

[vvb2060]

I did this

curl --http3-only https://1.1.1.1/cdn-cgi/trace

I expected the following

sni=off

curl/libcurl version

curl 8.2.1 (x86_64-w64-mingw32) libcurl/8.2.1 OpenSSL/3.1.2 (Schannel) zlib/1.3 brotli/1.1.0 zstd/1.5.5 WinIDN libssh2/1.11.0 nghttp2/1.56.0 ngtcp2/0.19.1 nghttp3/0.15.0

operating system

windows

[vvb2060]

https://www.rfc-editor.org/rfc/rfc6066#section-3

Literal IPv4 and IPv6 addresses are not permitted in "HostName".