[Social] [7.3] Select OpenZeppelin to audit Governor Nexus

Summary

TL;DR: Governor Nexus is implemented and needs an external audit before any deployment proposal. We propose OpenZeppelin as the auditor. If this vote passes, the Meta-Governance Working Group will fund the audit from its existing contract audits budget. --- ## Context In August we published the Governor Nexus implementation report and opened a feedback window before moving to an external audit. In the same thread we...