chore(deps): update mcp toolbox server for integration tests to v0.20.0

[renovate-bot]

This PR contains the following updates:

Package	Update	Change
googleapis/genai-toolbox	minor	0.19.1 -> 0.20.0

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Release Notes

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

v0.20.0

Compare Source

Features

• Added prompt support for toolbox (#​1798) (cd56ea4)
• source/alloydb, source/cloud-sql-postgres,source/cloud-sql-mysql,source/cloud-sql-mssql: Use project from env for alloydb and cloud sql control plane tools (#​1588) (12bdd95)
• source/mysql: Set default host and port for MySQL source (#​1922) (2c228ef)
• source/Postgresql: Set default host and port for Postgresql source (#​1927) (7e6e88a)
• tool/looker-generate-embed-url: Adding generate embed url tool (#​1877) (ef63860)
• tools/postgres: Add list_triggers, database_overview tools for postgres (#​1912) (a4c9287)
• tools/postgres: Add list_indexes, list_sequences tools for postgres (#​1765) (897c63d)

OS/Architecture	Description	SHA256 Hash
linux/amd64	For Linux systems running on Intel/AMD 64-bit processors.	c6e3c98990d99a2f739af94df32f6d80b5f7ad2f286c39b25d9ccd5f819d61c5
darwin/arm64	For macOS systems running on Apple Silicon (M1, M2, M3, etc.) processors.	fe3965a9b6a90a6a039f2013dae571632a70cdf0d24b86fb9406fc76d11fc598
darwin/amd64	For macOS systems running on Intel processors.	11d7cd47cb6b052cce6256c65d73c239acaaa6368727460b2ace300a89af37b0
windows/amd64	For Windows systems running on Intel/AMD 64-bit processors.	939a593c88c70633d0074b3de0b08588c8e82e503ab1f1b5a0007749dc9a9716

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[anubhav756]

/gcbrun