Use netty-pkitesting for self-signed certs

Author: hyperxpro

client/pom.xml

@@ -180,6 +180,13 @@
             <scope>test</scope>
         </dependency>
 
+        <dependency>
+            <groupId>io.netty</groupId>
+            <artifactId>netty-pkitesting</artifactId>
+            <version>${netty.version}</version>
+            <scope>test</scope>
+        </dependency>
+
         <!-- Testcontainers for Docker-based integration tests -->
         <dependency>
             <groupId>org.testcontainers</groupId>

client/src/test/java/org/asynchttpclient/BasicHttp2Test.java

@@ -45,7 +45,8 @@
 import io.netty.handler.ssl.ApplicationProtocolNames;
 import io.netty.handler.ssl.SslContext;
 import io.netty.handler.ssl.SslContextBuilder;
-import io.netty.handler.ssl.util.SelfSignedCertificate;
+import io.netty.pkitesting.CertificateBuilder;
+import io.netty.pkitesting.X509Bundle;
 import io.netty.util.concurrent.GlobalEventExecutor;
 import org.asynchttpclient.test.EventCollectingHandler;
 import org.junit.jupiter.api.AfterEach;
@@ -335,9 +336,11 @@ public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
 
     @BeforeEach
     public void startServer() throws Exception {
-        SelfSignedCertificate ssc = new SelfSignedCertificate();
+        X509Bundle bundle = new CertificateBuilder()
+                .subject("CN=localhost")
+                .buildSelfSigned();
 
-        serverSslCtx = SslContextBuilder.forServer(ssc.certificate(), ssc.privateKey())
+        serverSslCtx = SslContextBuilder.forServer(bundle.toKeyManagerFactory())
                 .applicationProtocolConfig(new ApplicationProtocolConfig(
                         ApplicationProtocolConfig.Protocol.ALPN,
                         ApplicationProtocolConfig.SelectorFailureBehavior.NO_ADVERTISE,