Fix ssl_poll_perf perftool failure in CI

[andrewkdinh]

For example, https://github.com/openssl/perftools/actions/runs/22473745740/job/65096240434?pr=81

/__w/perftools/perftools/perftools/source/ssl_poll_perf.c:2984:5: error: 'SSL_set1_host' is deprecated: Since OpenSSL 4.0 [-Werror=deprecated-declarations]
 2984 |     if (SSL_set1_host(qconn, hostname) == 0) {
      |     ^~
In file included from /__w/perftools/perftools/perftools/source/ssl_poll_perf.c:47:
/__w/perftools/perftools/openssl/include/openssl/ssl.h:1923:34: note: declared here
 1923 | OSSL_DEPRECATEDIN_4_0 __owur int SSL_set1_host(SSL *s, const char *host);
      |                                  ^~~~~~~~~~~~~
cc1: all warnings being treated as errors