HTTP/3 support for CURLINFO_TLS_SSL_PTR is missing

### I did this

Use CURLINFO_TLS_SESSION or CURLINFO_TLS_SSL_PTR on a HTTP/3 connection and got NULL instead.

Ref: https://curl.se/mail/lib-2025-07/0001.html

### I expected the following

To get the SSL_CTX or SSL instance.

### curl/libcurl version

curl 8.14.1

### operating system

all, it's a feature not implemented 