Supervisor prints a new Buffer deprecation warning with node10

[CameronDiver]

This comes from the following: https://github.com/sidorares/dbus-native/issues/271#issuecomment-580262777

The fix it seems would be to move away from dbus-native. A possible replacement is https://github.com/Shouqun/node-dbus which does not rely on put.

[balena-ci]

[camerondiver] This issue has attached support thread https://jel.ly.fish/#/support-thread~c8ceb226-9aa5-4ff6-b40d-501931349b66