Update net-im/libquotient and consumers

New quotient release supports easier homeserver discovery. Chase it,
and then update neochat to the latest release that supports that,
and a newer quaternion (demonstration Matrix client).

Release notes for the three are at:
https://github.com/quotient-im/libQuotient/releases/tag/0.6.4
https://github.com/quotient-im/Quaternion/releases/tag/0.0.9.5-beta2
https://carlschwan.eu/2021/01/13/neochat-1.0.1-first-bugfix-release/