packaging: rpm_ci: don't shade scram jar into pgjdbc
packaging: rpm_ci: don't shade scram jar into pgjdbc

Drop the maven-shade-plugin dependency entirely.

Complements: 4e0cdc13ec659f

lordnelson/pgjdbc,sehrope/pgjdbc,AlexElin/pgjdbc,davecramer/pgjdbc,sehrope/pgjdbc,marschall/pgjdbc,golovnin/pgjdbc,davecramer/pgjdbc,zapov/pgjdbc,marschall/pgjdbc,pgjdbc/pgjdbc,sehrope/pgjdbc,whitingjr/pgjdbc,AlexElin/pgjdbc,pgjdbc/pgjdbc,davecramer/pgjdbc,AlexElin/pgjdbc,lordnelson/pgjdbc,golovnin/pgjdbc,marschall/pgjdbc,lordnelson/pgjdbc,jorsol/pgjdbc,jorsol/pgjdbc,davecramer/pgjdbc,golovnin/pgjdbc,marschall/pgjdbc,sehrope/pgjdbc,pgjdbc/pgjdbc,jorsol/pgjdbc,whitingjr/pgjdbc,whitingjr/pgjdbc,pgjdbc/pgjdbc,jorsol/pgjdbc,zapov/pgjdbc,zapov/pgjdbc