add @Version property to all RBAC-Entities (#34)

Co-authored-by: Michael Hoennig <michael@hoennig.de>
Reviewed-on: https://dev.hostsharing.net/hostsharing/hs.hsadmin.ng/pulls/34
Reviewed-by: Marc Sandlus <marc.sandlus@hostsharing.net>

src/main/resources/db/changelog/5-hs-office/505-bankaccount/5050-hs-office-bankaccount.sql

@@ -6,6 +6,7 @@
 create table hs_office_bankaccount
 (
     uuid                uuid unique references RbacObject (uuid) initially deferred,
+    version             int not null default 0,
     holder              varchar(64) not null,
     iban                varchar(34) not null,
     bic                 varchar(11) not null