chore: update bundled Zoekt

[sourcebot-release-bot]

Summary

• advance vendor/zoekt to e7e8c16029084fb2b334b41b9bf0f69b3ef7e340
• include Zoekt changes through sourcebot-dev/zoekt#27

This pull request is maintained automatically and may be updated when additional Zoekt pull requests merge.

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Note

Medium Risk
Advancing the Zoekt submodule can change indexing and search behavior; risk depends on what landed in the fork PR rather than on Sourcebot application code in this diff.

Overview
Bumps the bundled vendor/zoekt submodule to commit e7e8c16029084fb2b334b41b9bf0f69b3ef7e340, incorporating upstream work from sourcebot-dev/zoekt#27.

The only change visible in this diff is changelog housekeeping: the existing Unreleased “Updated the bundled Zoekt version” entry now also references PR #1647 (alongside #1646).

^{Reviewed by Cursor Bugbot for commit 5188117. Bugbot is set up for automated code reviews on this repo. Configure here.}

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Summary by cubic

Advances the bundled vendor/zoekt submodule to e7e8c16029084fb2b334b41b9bf0f69b3ef7e340, pulling in changes through sourcebot-dev/zoekt#27. Updates the changelog to track the bundled version bump.

^{Written for commit 5188117. Summary will update on new commits.}

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