gomod: update zoekt for faster ready checks
Created by: keegancsmith
- https://github.com/sourcegraph/zoekt/commit/6a91f0b753 webserver: log traceID in WithTrace instead of field
- https://github.com/sourcegraph/zoekt/commit/543ddf9885 ranking: favor short paths and multiple matches
- https://github.com/sourcegraph/zoekt/commit/37cdc94f44 shards: unexport NewDirectoryWatcher
- https://github.com/sourcegraph/zoekt/commit/d749d80b21 webserver: do not wait until all shards loaded to be available
Test Plan: CI
Co-authored-by: @stefanhengl