io.netty 4.1.89.Final is using unsupported JDK internal APIs

[zheyuanOCDN]

Describe the feature request
mockerserver 5.15 is depending on io.netty 4.1.89.Final, which is using sun.security.x509.. However sun.security.x509. became unsupported JDK internal APIs after jdk1.8.

What you are trying to do
We are trying to migrate our application to JDK17.

The solution you'd like
Depend on latest io.netty to avoid calling sun.security.x509.*.