fix(rustproxy-http): disable HTTP/3 GREASE for client and server connections

rust/crates/rustproxy-http/src/h3_service.rs

@@ -75,7 +75,9 @@ impl H3ProxyService {
         debug!("HTTP/3 connection from {} on port {}", remote_addr, port);
 
         let mut h3_conn: h3::server::Connection<h3_quinn::Connection, Bytes> =
-            h3::server::Connection::new(h3_quinn::Connection::new(connection))
+            h3::server::builder()
+                .send_grease(false)
+                .build(h3_quinn::Connection::new(connection))
                 .await
                 .map_err(|e| anyhow::anyhow!("H3 connection setup failed: {}", e))?;