update der gradle version, to build successfully on Linux and Windows.

Thomas Weigelrequested to merge
istthweig/base-project:patch-1 into master

gradle version update

My college (on Windows 10) and I (on ubuntu) get some trubble with the build pipeline. We noticed, that we fixed it with an update of gradle to 6.3.

Edited by Lukas Köhler

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