chore(main): release 1.74.0

[release-please]

🤖 I have created a release beep boop

1.74.0 (2026-04-29)

Features

• [Interactions] Add FileCitation.{custom_metadata,media_id,page_number} (aed41ec)
• Add output_info to BatchJob (7b77ab8)
• Add gemini-3.1-flash-tts-preview model to options (8bdc1c3)
• Add ImageResizeMode for GenerateVideos (317d2af)
• Add new Gemini Deep Research agent models (16fffbd)
• Add one_of support to JSONSchema for Agent Platform (8c00c52)
• Add Vertex Dataset input and output options for batch jobs (d880f92)
• interaction-api: Add grounding tool usage breakdown to Interaction Usage. (b24fb5a)
• Introduce enterprise to Client constructor and GOOGLE_GENAI_USE_ENTERPRISE (693fd9a)
• Replace the more ambiguous rate field with sample_rate. (88d9b4a)

Bug Fixes

• Catch google-auth wrapped errors (48ac850)
• Removing Python 3.9 support due to EOL (8bc2b10)
• retry: Retry on httpx.TimeoutException with HttpRetryOptions (#2345) (0598bab)
• Streaming method doesn't handle multi-line SSE (f8a2e7e)
• Typing in AsyncClient.__aexit__, __exit__. (a74dc65)

Documentation

• Add instruction for custom endpoint (dd79904)
• Fix broken link for rate limits (d22ea99)
• Regenerate docs for 1.73.1 (2fb714b)
• Remove duplicate line in genai client docstring. (b1c6026)
• Replace Vertex AI with Gemini Enterprise Agent Platform (7c1ecd5)
• Update doc string to replace Vertex AI with Gemini Enterprise Agent Platform, update method error message to replace Vertex AI with Gemini Enterprise Agent Platform (previously known as Vertex AI), update converter error message to replace Vertex AI with Gemini Enterprise Agent Platform (413f0f9)
• Update Gemini Enterprise Agent Platform home page url (b02cb95)
• Update README.md with correct Pydantic link (fa97cc6)
• Update README.md with correct Pydantic link (fa97cc6)

---

This PR was generated with Release Please. See documentation.