* SQL Expressions: Bump GMS for STDDEV(), VARIANCE()
Bump Go MySQL Server to the latest version, to get support for STDDEV()
and VARIANCE() functions, and their aliases.
See https://github.com/dolthub/go-mysql-server/pull/2928
* Update app-code to comply with latest GMS version
* Run `go mod tidy`
* Update test which had depended on STDDEV being missing
* Run `make update-workspace`