[bisq-network/bisq] Upgrade JavaFX to v15 (#4242)

[Stan]

About the Gradle upgrade...  Gradle 7.0 removes a lot deprecated API, and this PR's build file would need to migrate to all the new dependency configurations `compile` -> `api` or `implementation`, `testCompile` -> `testImplementation`, etc...  to get it to work with Gradle 7.0  There are other changes that will need to be made as well.   We got by using a lot of deprecated parts of the Gradle API that will break the Bisq build in 7.0.

I got a Gradle 7 build working yesterday, and you might be interested in discussing some of the changes needed to upgrade to v7.0 after this PR is merged.

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