[java] Set protected as ClientConfig constructor instead of private (#10985)

Co-authored-by: Diego Molina <[email protected]>

Author: KazuCocoa

java/src/org/openqa/selenium/remote/http/ClientConfig.java

@@ -39,7 +39,7 @@ public class ClientConfig {
   private final Proxy proxy;
   private final Credentials credentials;
 
-  private ClientConfig(
+  protected ClientConfig(
     URI baseUri,
     Duration connectionTimeout,
     Duration readTimeout,