fix: OpenBSD does not support TCPKeepalive intervals (#1382)

Signed-off-by: houseme <housemecn@gmail.com>
Co-authored-by: houseme <housemecn@gmail.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

crates/utils/src/sys/user_agent.rs

@@ -15,6 +15,7 @@
 use rustfs_config::VERSION;
 use std::env;
 use std::fmt;
+#[cfg(not(any(target_os = "openbsd", target_os = "freebsd")))]
 use sysinfo::System;
 
 /// Business Type Enumeration