Upgrade CDI API used in Narayana cdi module from 1.2 to 2.0

Upgrading the CDI API used in Narayana CDI module to 2.0 - i.e. here: https://github.com/jbosstm/narayana/blob/5.11.2.Final/ArjunaJTA/cdi/pom.xml#L103
Currently we are at version 1.2 which is 7 years old. The API definition of 2.0 is backward compatible. The WildFly uses the CDI api in version 2.0 from version 12.0.0.Final (https://github.com/wildfly/wildfly/blob/12.0.0.Final/pom.xml).