[ARFC] Sigma Prime audit budget extension

Summary

Request the community for a budget extension of 162’000 USDT to Sigma Prime, for security reviews of Aave Governance V3 and a.DI (completion of both after fixes), and the GHO Stability Module (GSM).

Context

End of July, the continuous engagement of Sigma Prime <> Aave came to an end, after a quite productive year of collaboration.

From the BGD side, all the necessary projects have been finished apart from a re-review of Aave Governance v3 and a.DI, after the procedures of Certora. On the GHO side, the GSM project will be pretty soon ready for review, which will require security review resources.

We think Sigma Prime is a natural choice to finish the security reviews of these projects.

The total estimated person-days is 30, and the rate is the same as on the previous yearly engagement. If some of those person-days would not be allocated, the extra funds will be returned by SigmaPrime to the Aave Ethereum Collector.