gomod: bump zoekt to include rename fix
Created by: keegancsmith
See Zoekt commits for details.
- https://github.com/sourcegraph/zoekt/commit/8de66e0 indexserver: remove shards with inconsistent repo name
- https://github.com/sourcegraph/zoekt/commit/317cffc indexserver: allow faking ID in FS based discovery
Fixes #29685 (closed)