[bisq-network/bisq] Bump gradle wrapper to version 5.6.4 (#3615)

[Christoph Atteneder]

> @ripcurlx I think the same happened here... Is gradle 5.6.4 causing problems with TravisCI?

Yes, your PR got Abuse detected again. Maybe your account got flagged by Travis? Let me quickly open a branch myself and cherry-pick your commits to make sure it is not because of the Gradle update.

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