[bisq-network/bisq] Update to JDK11 (#1810)

[Christoph Atteneder]

@devinbileck I ran `./gradlew build` (macOS 10.13.6, Oracle JDK 11.0.1) but got following error:
```
FAILURE: Build failed with an exception.

* Where:
Build file '/Users/christoph/Documents/Workspaces/Java/mono-repo/bisq/core/build.gradle' line: 71

* What went wrong:
A problem occurred evaluating project ':core'.
> Could not resolve all files for configuration ':core:testCompile'.
   > Could not resolve com.github.MicroUtils:kotlin-logging:3aedaa9310.
     Required by:
         project :core > project :p2p > com.github.JesusMcCloud.netlayer:tor.native:0.4.2
         project :core > project :p2p > com.github.JesusMcCloud.netlayer:tor.native:0.4.2 > com.github.JesusMcCloud.netlayer:tor:0.4.2
      > Could not resolve com.github.MicroUtils:kotlin-logging:3aedaa9310.
         > Could not get resource 'https://jitpack.io/com/github/MicroUtils/kotlin-logging/3aedaa9310/kotlin-logging-3aedaa9310.pom'.
            > Could not HEAD 'https://jitpack.io/com/github/MicroUtils/kotlin-logging/3aedaa9310/kotlin-logging-3aedaa9310.pom'.
               > peer not authenticated
```

@ManfredKarrer Does it run on your local setup?

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