Replace retired Gemini preview in Vertex tutorial

[defangdevs]

Updates the GCP Vertex tutorial examples from the retired Gemini 2.5 Pro preview endpoint to Gemini 3.5 Flash.

Summary by CodeRabbit

• Documentation
  • Updated the Vertex AI deployment tutorial to recommend the google/gemini-3.5-flash model in its guidance and example configuration.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Advanced

Run ID: ffdc273d-f7d2-4a36-a390-247f8832f995

📥 Commits

Reviewing files that changed from the base of the PR and between 0f66176 and 679b392.

📒 Files selected for processing (1)

• docs/tutorials/deploy-openai-apps/gcp-vertex.mdx

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📝 Walkthrough

Walkthrough

The tutorial changes three Vertex AI model references from google/gemini-2.5-pro-preview-03-25 to google/gemini-3.5-flash.

Changes

Vertex AI model update

Layer / File(s)	Summary
Update tutorial model references docs/tutorials/deploy-openai-apps/gcp-vertex.mdx	The model selection snippet, model-selection tip, and complete compose example now use google/gemini-3.5-flash.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~3 minutes

Change: Bug fix

Suggested reviewers: lionello

Merge Risk: ⚪ Minimal · up to 679b3

The tutorial now consistently documents the intended Gemini 3.5 Flash model, with no established merge-blocking risk.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: replacing the retired Gemini preview model in the Vertex tutorial.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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