chore(deps): update mcp toolbox server for integration tests to v1.6.0

[renovate-bot]

This PR contains the following updates:

Package	Update	Change
googleapis/mcp-toolbox	minor	1.5.0 → 1.6.0

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Release Notes

googleapis/mcp-toolbox (googleapis/mcp-toolbox)

v1.6.0

Compare Source

Features

• Support MCP 2026 draft specs (#​3544) (d12eaa8)
• release: Add digital signature to Toolbox binaries (#​3528) (3f0f0af)
• tool/cloud-storage: Configure object operation parameters (#​3529) (d6dc5fe)
• tool/cloud-storage: Support configurable parameters (#​3478) (bc2de2a)
• tools/dataplex-list-data-products: Add dataplex-list-data-products tool (#​3337) (6dd669a)
• tools/dataplex-get-data-product: Add dataplex-get-data-product tool (#​3499) (7ea7a09)
• tools/dataplex-list-data-assets: Add dataplex-list-data-assets tool (#​3500) (182f933)
• tools/looker: Support complex filter_expression parameter in queries (#​3494) (997fb8c)
• tools/looker: Support dynamic_fields parameter in queries (#​3507) (cd22b89)

Bug Fixes

• tools/gda: Support mTLS and GOOGLE_API_USE_MTLS_ENDPOINT for GDA client (#​3460) (cc2a61e)
• tools/looker-conversational-analytics: Validate explore_references shape instead of panicking (#​3531) (b67419d)
• tool/looker-create-view-from-table: Correct Looker API payload structure (#​3515) (18c539c)

OS/Architecture	Description	SHA256 Hash
linux/amd64 (Signature)	For Linux systems running on Intel/AMD 64-bit processors.	0cd6fa1773926a37e55c803542f16ef621eaea38b015ec9778dfaae9f30da302
darwin/arm64	For macOS systems running on Apple Silicon (M1, M2, M3, etc.) processors.	feb567fb8416504004ff99acd4661278a88d70cc137681f6535a5e54469c6594
darwin/amd64	For macOS systems running on Intel processors.	fbb5af6b170431edb08741828a2581f9ee8548dd37c3e8222a3c2722f0007f32
windows/amd64	For Windows systems running on Intel/AMD 64-bit processors.	3be7e587c86dd9dbdb593a380396f399358c179ce37aed3045b4c8bf42569394
windows/arm64	For Windows systems running on ARM 64-bit processors.	3c6345114032a0671a5b66764673124ec4c27b5b41d1816ea15ac8afb5ca7cdc

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[dpebot]

/gcbrun

[twishabansal]

/gcbrun

[twishabansal]

@anubhav756 need to ensure all workflows are secure and do something like this: googleapis/mcp-toolbox-sdk-js#398