fix!: [VectorSearch] Removed obsolete field vertex from message .google.cloud.vectorsearch.v1.Ranker (#8955)

* fix!: Removed obsolete field `vertex` from message `.google.cloud.vectorsearch.v1.Ranker`
fix!: Removed obsolete message `VertexRanker`

PiperOrigin-RevId: 876103073

Source-Link: googleapis/googleapis@a383b6b

Source-Link: googleapis/googleapis-gen@2774daa
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* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

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Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

Author: gcf-owl-bot[bot]