Prop 59: Upgrade quicksilverd to v1.7.7

This proposal aims to upgrade Quicksilver mainnet (quicksilver-2) to v1.7.7 of quicksilverd.

This release includes a couple of bugfixes relating to garbage collection for unbonding records and stale icq queries, introduced in v1.7.6. More details have be found here: https://github.com/quicksilver-zone/quicksilver/releases/tag/v1.7.7