gomod: update zoekt for improved List performance
Created by: camdencheek
Pulling in the changes from https://github.com/sourcegraph/zoekt/pull/418
Updated with ./dev/zoekt/update
- https://github.com/sourcegraph/zoekt/commit/d749d80b21 webserver: do not wait until all shards loaded to be available
- https://github.com/sourcegraph/zoekt/commit/2478bf5713 go mod tidy
- https://github.com/sourcegraph/zoekt/commit/e97813e3ea deps: upgrade github.com/sourcegraph/log
- https://github.com/sourcegraph/zoekt/commit/d1964a317f Improve performance of List
Test plan
Unit tests.