Upgrade to atleast java 9 to use Jakarta EE 9 namespace

[hdip]

Upgrading to atleast java 9 to use Jakarta EE 9 namespace will become increasingly necessary to play nice with other frameworks.
Spring framework 6 and spring boot 3 have this minimum requirement

Changes needed include references to javax -> jakarta packages

[pwachira]

Maybe something like this pwachira@3f965ab

[timguy]

@pwachira this looks fine. Could you create a PR for your changes so all could benefit from it in an official release?

[claudemamo]

@hdip: I've been looking into this and, as I understand it, we don't need to compile to Java 9 so that Smooks can play nicely with other frameworks. Replacing references to the Javax Annotation API with the Jakarta Annotation API should be sufficient.