Change to Jakarta EE Namespace

[jo-elimu]

Due to Oracle’s ownership of the “Java” trademark, usage of the javax.* namespace has been restricted, and the jakarta.* namespace was adopted by the Eclipse Foundation.

To be able to upgrade from Servlet 4.0 to Servlet 5.0 (the version used by Jetty 11), we need to change from *.javax to *.jakarta.

https://stackoverflow.com/questions/68707177/upgrade-servlet-4-0-1-to-servlet-5-0

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Relates to #1698