Add CONNECT_TIMEOUT_MILLIS to fix timeout errors.

proxy/src/main/java/com/velocitypowered/proxy/connection/backend/VelocityServerConnection.java

@@ -56,6 +56,7 @@ public class VelocityServerConnection implements MinecraftConnectionAssociation,
         CompletableFuture<ConnectionRequestBuilder.Result> result = new CompletableFuture<>();
         server.initializeGenericBootstrap()
                 .option(ChannelOption.TCP_NODELAY, true)
+                .option(ChannelOption.CONNECT_TIMEOUT_MILLIS, SERVER_READ_TIMEOUT_SECONDS * 1000)
                 .handler(new ChannelInitializer<Channel>() {
                     @Override
                     protected void initChannel(Channel ch) throws Exception {

proxy/src/main/java/com/velocitypowered/proxy/network/ConnectionManager.java

@@ -89,6 +89,7 @@ public final class ConnectionManager {
                         ch.pipeline().addLast(Connections.HANDLER, connection);
                     }
                 })
+                .childOption(ChannelOption.CONNECT_TIMEOUT_MILLIS, CLIENT_READ_TIMEOUT_SECONDS * 1000)
                 .childOption(ChannelOption.TCP_NODELAY, true)
                 .childOption(ChannelOption.IP_TOS, 0x18)
                 .localAddress(address);