fix(deps): update dependency com.google.genai:google-genai to v1.21.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
com.google.genai:google-genai	1.20.0 -> 1.21.0

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Release Notes

googleapis/java-genai (com.google.genai:google-genai)

v1.21.0

Features

• Add NO_IMAGE enum value to FinishReason (6b00c0b)
• Add labels field to Imagen configs (e69cf68)
• Add thinking_config for live (274c21d)
• Add utility methods for creating FunctionResponsePart and creating FunctionResponse Part with FunctionResponseParts (af16a4c)
• Enable Ingredients to Video and Advanced Controls for Veo on Gemini Developer API (Early Access Program) (4c42e65)

Bug Fixes

• Ensure Live server message are properly converted (206dc88)

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[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.00% (target: -1.00%)	✅ ∅

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (79d6655)	7315	5012	68.52%
Head commit (480a6de)	7315 (+0)	5012 (+0)	68.52% (+0.00%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#418)	0	0	∅ (not applicable)

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