Update jackson-databind-2.9.6 to the 2.15.*

[muratugureminoglu]

jackson-databind-2.9.6 include in ./lib/ehcache-2.10.6.jar and has some vulnertabilities.

[mekya]

After the analysis, we find that there is no jackson-databind-2.9.6 dependency. It's 2.15.3.

After that @muratugureminoglu figured out that one dependency has another dependency(ehcache) and that dependecy list the jackson-databind in the following file.

ehcache-2.10.6.jar > rest-management-private-classpath/META-INF/maven/com.fasterxml.jackson.core/jackson-databind/pom.xml

 <groupId>com.fasterxml.jackson.core</groupId>
  <artifactId>jackson-databind</artifactId>
  <version>2.9.6</version>
  <name>jackson-databind</name>
  <packaging>bundle</packaging>

We don't use the rest api of ehcache so that this warning is a false alarm.

Anyway, we just update ehcache version that has listing for jackson-databind-2.11.1