fix: simplify grpc server setup

Author: diegomarquezp

pqc-test/pqc-test-common/src/main/java/com/google/api/gax/pqc/PqcTestServer.java

@@ -34,6 +34,7 @@
 import com.sun.net.httpserver.HttpsServer;
 import io.grpc.Server;
 import io.grpc.netty.NettyServerBuilder;
+import io.netty.handler.ssl.OpenSslContextOption;
 import java.io.InputStream;
 import java.io.OutputStream;
 import java.net.InetSocketAddress;
@@ -174,15 +175,15 @@ public void configure(HttpsParameters params) {
     // 12. Initialize netty SSL Context builder to establish gRPC server channel secure layers.
     //     Bind the builder explicitly to Bouncy Castle JSSE provider context.
     io.netty.handler.ssl.SslContextBuilder nettySslContextBuilder =
-        io.netty.handler.ssl.SslContextBuilder.forServer(kmf).sslContextProvider(bcProvider);
+				io.netty.handler.ssl.SslContextBuilder.forServer(kmf);
 
     // 14. Finalize compiling standard Netty SSL configurations.
     //     Force Netty to execute handshakes utilizing the standard JRE (JDK) SSL Provider
     //     so Bouncy Castle JJSSE (registered in the provider context) manages the secure pipelines.
     io.netty.handler.ssl.SslContext nettySslContext =
         io.grpc.netty.GrpcSslContexts.configure(
                 nettySslContextBuilder, io.netty.handler.ssl.SslProvider.JDK)
-            .protocols("TLSv1.3") // Force TLSv1.3 protocols
+						.option(OpenSslContextOption.GROUPS, new String[] { "X25519MLKEM768" })
             .build();
 
     // 15. Build a raw gRPC method descriptor to mock a unary SayHello endpoint.