feat(deps): update dependency googleapis/genai-toolbox to v0.21.0

[renovate-bot]

This PR contains the following updates:

Package	Update	Change
googleapis/genai-toolbox	minor	0.20.0 -> 0.21.0

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Release Notes

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

v0.21.0

Compare Source

⚠ BREAKING CHANGES

• tools/spanner-list-tables: Unmarshal object_details json string into map to make response have nested json (#​1894) (446d62a)

Features

• tools/postgres: Add long_running_transactions, list_locks and replication_stats tools (#​1751) (5abad5d)

Bug Fixes

• tools/alloydbgetinstance: Remove parameter duplication (#​1993) (0e269a1)
• tools: Check for query execution error for pgxpool.Pool (#​1969) (2bff138)

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BEGIN_COMMIT_OVERRIDE
feat: tools/postgres: Add long_running_transactions, list_locks and replication_stats tools (genai-toolbox#​1751) (5abad5d)
fix: tools: Check for query execution error for pgxpool.Pool (genai-toolbox#​1969) (2bff138)
END_COMMIT_OVERRIDE