chore(deps): update dependency google-genai to ~=2.19.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	Pending	OpenSSF
google-genai	project.optional-dependencies	minor	~=2.18.1 → ~=2.19.0	2.20.0

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Release Notes

googleapis/python-genai (google-genai)

v2.19.0

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Features

• Add mode enum (VERBATIM, SMART) to AudioTranscriptionConfig and TranscriptionConfig. (e8cd7d0)
• Add enable_data_retention to ToolParallelAiSearch, Add step_count to ReinforcementTuningHyperParameters, Add BidiGenerateContentSetup (656da78)
• Add IDLE state to live connection status enum and mark REQUIRES_ACTION as deprecated. (599d89f)
• Add video resolution and extension task parameters (c3bdb88)

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