upgrade maven-jar-plugin: fixes Reproducible Builds issue

[hboutemy]

rework on #2519, in 2 steps: upgrade jar plugin first, then we'll see on removing the Git branch name configuration later

Purpose

Linked issue: close #xxx

Tests

API and Format

Documentation

[hboutemy]

upgrading the jar plugin works: no problem found by CI
but dropping the Git branch name (8c8afbf) makes 2 tests fail:

• End to End Tests Flink 1.17
• Flink CDC Tests

I'm reverting the Git branch name removal: let's merge the good first step, that will solve one key prerequisite for full Reproducible Builds (sources-jar reproducibility should be ok, for example, but not yet normal jar files, that have the branch name in META-INF/MANIFEST)

[JingsongLi]

Thanks @hboutemy , +1 for merging.