CELDEV-969 - [Security] May 2021 Upgrade Dependencies (#280)
CELDEV-969 - [Security] May 2021 Upgrade Dependencies (#280)

* update parent pom to 5.2-SNAPSHOT

* add deprecated test support

* update dependencies

* update celements-model to 5.1-SNAPSHOT

* update jtidy dependency

* formating pom file
celements/celements-core,celements/celements-core