Upgrade Jersey to 2.30

For better JDK11 support, this issue aims to upgrade *Jersey* and *javassist* to `2.30` and `3.35.0-GA` respectively.

Jersey:

• https://eclipse-ee4j.github.io/jersey.github.io/release-notes/2.30.html
• https://github.com/eclipse-ee4j/jersey/issues/4245 (Java 11 java.desktop module dependency)

javassist: This is a transitive dependency upgrade from 3.20.0-CR2 to 3.25.0-GA.

• `javassist` officially supports JDK11 from [3.24.0-GA release note](https://github.com/jboss-javassist/javassist/blob/master/Readme.html#L308).