[FEATURE]: Use JORAM gas prices

[carlosrsabreu]

Is your feature request related to a problem? Please describe.

_{A clear and concise description of the problem. Ex. I'm always frustrated when [...]}

We should drop DRET gas prices (they are unstable and the format constantly changes).

Describe the solution you'd like

_{A clear and concise description of what you want to happen.}

Use JORAM gas prices (more stable, using the same format).

Describe alternatives you've considered

_{A clear and concise description of any alternative solutions or features you've considered.}

Additional context

_{Add any other context or screenshots about the feature request here.}