Update zoekt webserver version

What does this MR do?

Updates zoekt-webserver to newer commit: 52a28e3f9e9ef94a44d6d58deccf49e00c8fa59f .

Comparison between commits: https://github.com/sourcegraph/zoekt/compare/fcb279ae404c0aa102121b28257143ad16e77482..52a28e3f9e9ef94a44d6d58deccf49e00c8fa59f

This is part of a series of MRs:

• Update CNG docker image !1795 (closed) 👈 (this MR)
• Update GDK gitlab-org/gitlab-development-kit!3667 (diffs)
• Update CI docker image: TBD

Related issues

Checklist

See Definition of done.

For anything in this list which will not be completed, please provide a reason in the MR discussion

Required

• Merge Request Title, and Description are up to date, accurate, and descriptive
• MR targeting the appropriate branch
• MR has a green pipeline on GitLab.com
• When ready for review, MR is labeled "~workflow::ready for review" per the Distribution MR workflow

Expected (please provide an explanation if not completing)

• Test plan indicating conditions for success has been posted and passes
• Documentation created/updated
• Integration tests added to GitLab QA
• The impact any change in container size has should be evaluated
• New dependencies are managed with dependencies.io