Remove jaxb-impl from integrations/cdi/jpa-cdi/pom.xml

[ljnelson]

It appears that the jaxb-impl jar and the jaxb-runtime jars are not needed by the JPA integration. It further appears that only jaxb-runtime is needed by the JPA integration at runtime. Both are currently present at runtime.

Side note: it may be that the Maven plugin responsible for JAXB code generation requires jaxb-impl but if so that is up to the plugin, not the integration.

[ljnelson]

See also https://stackoverflow.com/a/72151763/208288 for some background and https://github.com/eclipse-ee4j/jaxb-ri/blob/4.0.6-RI/jaxb-ri/runtime/impl/pom.xml#L25-L26 for more information.