Adjust fee calculation for GA [IRIS]

[noandrea]

• I'm submitting a ...

  • [ ] bug report
  • [x] feature request
  • [ ] support request => Please do not submit support request here, see note at the top of this template.

• What is the motivation / use case for changing the behavior?

from IRIS onward there is a change about how the fee is calculated for GA

it is mentioned here https://github.com/aeternity/aeternity/pull/2999

Nee to find out the difference and apply them for the next major relase

• Other information (e.g. detailed explanation, stacktraces, related issues, suggestions how to fix, links for us to have context, eg. forum, telegram, etc)