Update vulnerable dependencies

Update vulnerable dependencies

- consistently use the same logback version everywhere (1.2.10 -> 1.2.11)
- consistently uuse the same kafka-clients version everywhere (3.3.1 -> 3.3.2)
- declare ehcache dependency in aai-client pom instead of common since it
  is only used there

Issue-ID: SO-4199
Change-Id: Id8b5c6c061e6f0921e45fb6763fe2384f0315fe4
Signed-off-by: Fiete Ostkamp <Fiete.Ostkamp@telekom.de>