[bisq-network/bisq] Bump gradle wrapper to version 5.6.2 (#3422)

[Christoph Atteneder]

I personally use Gradle v5.6.2 for some time already and never had any issues building Bisq so far.
@devinbileck Could you give it a run on Windows as well?
@wiz Could you give it a run on Linux as well?

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