[bisq-network/bisq] Upgrade to Gradle 7.3 (PR #5824)

[Christoph Atteneder]

```
------------------------------------------------------------
Gradle 6.6.1
------------------------------------------------------------

Build time:   2020-08-25 16:29:12 UTC
Revision:     f2d1fb54a951d8b11d25748e4711bec8d128d7e3

Kotlin:       1.3.72
Groovy:       2.5.12
Ant:          Apache Ant(TM) version 1.10.8 compiled on May 10 2020
JVM:          11.0.11 (Oracle Corporation 11.0.11+9-LTS-194)
OS:           Windows 10 10.0 amd64
```

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