Move to java 8 and update dependencies

[aleksandr-m]

No description provided.

[DRoppelt]

if java8 becomes the baseline, the plugin versions pinned with this can be pulled up to more recent versions: #330

for instance, versions-maven-plugin with 2.8.1 from 2010 pulls in strutsv1 (which we in our org noticed as the mvn-repositury was flaggen on our build nodes)

[DRoppelt]

The latest maven release, 3.9.0, now also has Java 8 as baseline https://maven.apache.org/docs/3.9.0/release-notes.html

Minimum Java version to use with Maven 3.9.0 is raised to Java 8.

I wanted to check if the project & its testcases work with maven 3.9.0, but are not runnable due to that change. I will prepare a PR for java8 but I am not offended if it lays around for a while.

[DRoppelt]

I got stuck for a while since the tests kept being red, I missed that this has changed meanwhile 3327fb5 this was not related, nvm

PR is in progress

[DRoppelt]

Now that 1.20.0 is released... what do you think about bringing this ticket/PR into the next release? And if so, when?

I think that you mentioned that this ticket was more for intent than actually working on it in november. With the change of maven 3.9.X having java 8 as minimum version (https://maven.apache.org/docs/3.9.0/release-notes.html), it feels like this is something that can be introduced in your plugin too?

[aleksandr-m]

Done.