Update jackson to 2.11.2

[hohwille]

As a devon4j user, I want to get new apps based on recent technology-stack so that I start a new project on recent libs rather than having known bugs and CVEs from the beginning leading to technical debt.

Current jackson version is 2.10.3:

devon4j/pom.xml

Line 35 in b540a8e

<jackson.version>2.10.3</jackson.version> <!-- Overriding Jackson for fixing vulnerabilities -->

Latest available version is 2.11.2:
https://repo1.maven.org/maven2/com/fasterxml/jackson/jackson-bom/

We should also consider if latest spring-boot already ships with most recent jackson and we do not need to override anymore (see #287).