如何解决Google TTS java客户端“找不到策略'pick_first'”的问题？

Maven：
<dependencies>
  <dependency>
    <groupId>io.grpc</groupId>
    <artifactId>grpc-core</artifactId>
    <version>1.40.0</version>
  </dependency>
  <dependency>
    <groupId>io.grpc</groupId>
    <artifactId>grpc-netty-shaded</artifactId>
    <version>1.40.0</version>
  </dependency>
  <dependency>
    <groupId>io.grpc</groupId>
    <artifactId>grpc-protobuf</artifactId>
    <version>1.40.0</version>
  </dependency>
  <dependency>
    <groupId>io.grpc</groupId>
    <artifactId>grpc-stub</artifactId>
    <version>1.40.0</version>
  </dependency>
  <dependency>
    <groupId>io.grpc</groupId>
    <artifactId>grpc-okhttp</artifactId>
    <version>1.40.0</version>
  </dependency>
  <dependency>
    <groupId>io.grpc</groupId>
    <artifactId>grpc-java</artifactId>
    <version>1.40.0</version>
  </dependency>
  <dependency>
    <groupId>io.grpc</groupId>
    <artifactId>grpc-alts</artifactId>
    <version>1.40.0</version>
  </dependency>
</dependencies>

Gradle：
dependencies {
  implementation 'io.grpc:grpc-core:1.40.0'
  implementation 'io.grpc:grpc-netty-shaded:1.40.0'
  implementation 'io.grpc:grpc-protobuf:1.40.0'
  implementation 'io.grpc:grpc-stub:1.40.0'
  implementation 'io.grpc:grpc-okhttp:1.40.0'
  implementation 'io.grpc:grpc-java:1.40.0'
  implementation 'io.grpc:grpc-alts:1.40.0'
}

import io.grpc.ManagedChannel;
import io.grpc.ManagedChannelBuilder;

public class GoogleTTSClient {
  public static void main(String[] args) {
    ManagedChannel channel = ManagedChannelBuilder
        .forAddress("host", port)
        .defaultLoadBalancingPolicy("round_robin")  // 设置默认的负载均衡策略
        .usePlaintext()
        .build();

    // 创建TTS客户端并进行后续操作
    // ...
  }
}