Maven compiler plugin java 1.8 as default

Maven compiler setting is configured to use java 1.8 as source and target.
In these days I would say java 1.8 is outdated.

May I ask, why still java 1.8 is used as a default ?

### Expected Behaviour
java 11 should be default

### Actual Behaviour
maven-compiler-plugin

1.8
1.8

### Reproduce Scenario (including but not limited to)

#### Steps to Reproduce

#### Platform and Version

#### Sample Code that illustrates the problem

#### Logs taken while reproducing problem

Inspect the generated Maven compiler plugin configuration in the archetype output, focusing on the source and target values shown in the issue. Confirm the project's supported Java versions and update the default to Java 11 if appropriate; done means generated projects use Java 11 for both settings and their existing build checks pass.

Written by the indexing model from the issue text.