Bump Zoekt chart to v1.4.0

What does this MR do?

This MR bumps the gitlab-zoekt chart to v1.4.0, which has been merged in Bump Zoekt indexer to v0.8.0 (gitlab-org/cloud-native/charts/gitlab-zoekt!89 - merged)

Related issues

gitlab-org/gitlab#467121 (closed)

Author checklist

For general guidance, please follow our Contributing guide.

Required

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

• Merge Request Title and Description are up to date, accurate, and descriptive.
• MR targeting the appropriate branch.
• MR has a green pipeline.
• Documentation created/updated.
• Tests added/updated, and test plan for scenarios not covered by automated tests.
• Equivalent MR/issue for omnibus-gitlab opened.

Reviewers checklist

• MR has a green pipeline on https://gitlab.com/gitlab-org/charts/gitlab.
• Consider downstream impact to the Operator, as per evaluating impact from changes to GitLab Chart.