chore: update bundled Zoekt

[sourcebot-release-bot]

Summary

• advance vendor/zoekt to d447c7fafec421918335225f366da45f22104622
• include Zoekt changes through sourcebot-dev/zoekt#26

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

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Note

Medium Risk
Advancing Zoekt affects repository indexing and code search behavior; risk depends on what shipped in the vendored commit, though this PR does not change Sourcebot application code beyond the changelog.

Overview
Bumps the bundled Zoekt dependency in vendor/zoekt to commit d447c7f, pulling in upstream/fork work from sourcebot-dev/zoekt#26.

The only change in this diff is a CHANGELOG entry under [Unreleased] → Changed, noting the Zoekt update (#1646). The PR description indicates this is an automated maintenance PR that may be refreshed as more Zoekt changes land.

^{Reviewed by Cursor Bugbot for commit 8c5b25c. Bugbot is set up for automated code reviews on this repo. Configure here.}

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Summary by cubic

Updates the bundled Zoekt dependency to include upstream changes through sourcebot-dev/zoekt#26 and adds a changelog entry.

^{Written for commit 8c5b25c. Summary will update on new commits.}

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