[bisq-network/bisq] Limit system ram to 4GB (#4048)

[cd2357]

> I haven't had any such errors before, or at least not for a very long time. Makes me think this change is probably the culprit.

Probably the culprit, or probably just didn't fix the underlying issue.

I [read somewhere](https://wiki.openjdk.java.net/pages/viewpage.action?pageId=20415996) that JavaFX also uses the system's video RAM, in addition to the normal RAM usually used by the Java VM.

This PR seems to restrict only the normal RAM usage -- we might have to investigate the VRAM side as well.

Btw, this means Bisq (or any JavaFX app) could behave differently on different systems, depending on that system's video settings (graphic card hardware? graphics drivers? amount of shared RAM between video and system? etc -- don't know what could play a role, but smth to keep in mind when looking at performance).

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