feat(deps): update dependency googleapis/genai-toolbox to v0.26.0

[renovate-bot]

This PR contains the following updates:

Package	Update	Change
googleapis/genai-toolbox	minor	0.25.0 → 0.26.0

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Release Notes

googleapis/genai-toolbox (googleapis/genai-toolbox)

v0.26.0

Compare Source

⚠ BREAKING CHANGES

• Validate tool naming (#​2305) (5054212)
• tools/cloudgda: Update description and parameter name for cloudgda tool (#​2288) (6b02591)

Features

• Add new user-agent-metadata flag (#​2302) (adc9589)
• Add remaining flag to Toolbox server in MCP registry (#​2272) (5e0999e)
• embeddingModel: Add embedding model to MCP handler (#​2310) (e4f60e5)
• sources/bigquery: Make maximum rows returned from queries configurable (#​2262) (4abf0c3)
• prebuilt/cloud-sql: Add create backup tool for Cloud SQL (#​2141) (8e0fb03)
• prebuilt/cloud-sql: Add restore backup tool for Cloud SQL (#​2171) (00c3e6d)
• Support combining multiple prebuilt configurations (#​2295) (e535b37)
• Support MCP specs version 2025-11-25 (#​2303) (4d23a3b)
• tools: Add valueFromParam support to Tool config (#​2333) (15101b1)

Bug Fixes

• tools/cloudhealthcare: Add check for client authorization before retrieving token string (#​2327) (c25a233)

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