chore: bump dockerfile go dependency

While trying to build the dockerfile located in the root of the project i ran into:

executor failed running [/bin/sh -c CGO_ENABLED=0 make PREFIX=/go clean binaries && file ./bin/registry | grep "statically linked"]: exit code: 2

This was raised when downloading go modules, because the dockerfile uses golang:1.17-alpine which we no longer support.

I've updated the dockerfile to golang:1.18-alpine instead.