Revert "codeintel: downgrade lsif-go to 1.6.7 to avoid OOMing"
Created by: chrismwendt
Reverts sourcegraph/sourcegraph#27213 now that lsif-go skips loading dependencies by default https://github.com/sourcegraph/lsif-go/pull/212 and its memory usage should be back down to what it was in v1.6.7.