[bisq-network/bisq] Bump gradle wrapper to version 5.6.4 (#3422)

[Christoph Atteneder]

Can you please add `distributionSha256Sum=1f3067073041bc44554d0efe5d402a33bc3d3c93cc39ab684f308586d732a80d` to the gradle-wrapper.properties file? This will cause a downloaded distribution to fail if it doesn't match the hash.
```
 bisq git:(sam/bump-gradle-wrapper) ✗ ./gradlew
Downloading https://services.gradle.org/distributions/gradle-5.6.4-bin.zip
.........................................................................................
Verification of Gradle distribution failed!

Your Gradle distribution may have been tampered with.
Confirm that the 'distributionSha256Sum' property in your gradle-wrapper.properties file is correct and you are downloading the wrapper from a trusted source.

 Distribution Url: https://services.gradle.org/distributions/gradle-5.6.4-bin.zip
Download Location: /Users/christoph/.gradle/wrapper/dists/gradle-5.6.4-bin/bxirm19lnfz6nurbatndyydux/gradle-5.6.4-bin.zip
Expected checksum: '1f3067073041bc44554d0efe5d402a33bc3d3c93cc39ab684f308586d732a80dxxx'
  Actual checksum: '1f3067073041bc44554d0efe5d402a33bc3d3c93cc39ab684f308586d732a80d'
```

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