chore(deps): update google-genai requirement from >=1.0.0 to >=2.9.0 in /backend

[dependabot]

Updates the requirements on google-genai to permit the latest version.

Release notes

Sourced from google-genai's releases.

v2.9.0

2.9.0 (2026-06-19)

Major updates

• The interactions implementation has been completely replaced. The public api surface is unchanged. (d830f16)

Features

• Add audioOffset to VoiceActivity (fb785e4)
• Add gemini-3-flash-preview (gemini-3.1, gemini-3.5, gemini-4 are already mapped) to the local tokenizer map. (749f8a1), closes #1972
• Add interimInputTranscription to LiveServerContent (fb785e4)
• Add LanguageAuto, LanguageHints, and adaptationPhrases to AudioTranscriptionConfig (fb785e4)
• Broaden publisher model path check to support all publishers (5d282e6)
• Add ServiceTier to UsageMetadata (45b4963)
• Expose Computer Use API fields (420b5a7)
• Gemma 4 local tokenizer support (ca97c58)
• interaction-api: Add presence_penalty, frequency_penalty, and cached_content to models.proto (05f16fe)
• interaction-api: Rename usage to total_usage in StreamMetadata. (7c331c6)

Bug Fixes

• Add fallback for aiohttp.readline without max_line_length for backward compatibility because we still want to keep aiohttp as optional dependency (e99ab99), closes #2487
• Fix header (f8f9749)
• Keep live music API keys out of websocket urls (#2564) (c754ebf)
• Make transformers an optional dependency for local tokenizers, also add other dependencies to local-tokenizer-extras. (528926b)
• Use .model_copy() instead of deprecated .copy() (216369f)

Changelog

Sourced from google-genai's changelog.

2.9.0 (2026-06-19)

Major updates

• The interactions implementation has been completely replaced. The public api surface is unchanged. (d830f16)

Features

• Add audioOffset to VoiceActivity (fb785e4)
• Add gemini-3-flash-preview (gemini-3.1, gemini-3.5, gemini-4 are already mapped) to the local tokenizer map. (749f8a1), closes #1972
• Add interimInputTranscription to LiveServerContent (fb785e4)
• Add LanguageAuto, LanguageHints, and adaptationPhrases to AudioTranscriptionConfig (fb785e4)
• Broaden publisher model path check to support all publishers (5d282e6)
• Add ServiceTier to UsageMetadata (45b4963)
• Expose Computer Use API fields (420b5a7)
• Gemma 4 local tokenizer support (ca97c58)
• interaction-api: Add presence_penalty, frequency_penalty, and cached_content to models.proto (05f16fe)
• interaction-api: Rename usage to total_usage in StreamMetadata. (7c331c6)

Bug Fixes

• Add fallback for aiohttp.readline without max_line_length for backward compatibility because we still want to keep aiohttp as optional dependency (e99ab99), closes #2487
• Fix header (f8f9749)
• Keep live music API keys out of websocket urls (#2564) (c754ebf)
• Make transformers an optional dependency for local tokenizers, also add other dependencies to local-tokenizer-extras. (528926b)
• Use .model_copy() instead of deprecated .copy() (216369f)

2.9.0-rc1 (2026-06-17)

Features

• Add audioOffset to VoiceActivity (fb785e4)
• Add gemini-3-flash-preview (gemini-3.1, gemini-3.5, gemini-4 are already mapped) to the local tokenizer map. (749f8a1), closes #1972
• Add interimInputTranscription to LiveServerContent (fb785e4)
• Add LanguageAuto, LanguageHints, and adaptationPhrases to AudioTranscriptionConfig (fb785e4)
• Broaden publisher model path check to support all publishers (5d282e6)

Miscellaneous Chores

• Release 2.9.0-rc1 (b95f2a8)

2.9.0-rc0 (2026-06-16)

Major updates

... (truncated)

Commits

• 84aa3ae chore(main): release 2.9.0 (#2635)
• 6119dd3 feat: Interactions is no longer in preview.
• 02921e1 chore: Remove experimental warnings for interactions
• f63d1dc chore: internal update
• 85fbda3 Copybara import of the project:
• f91f359 Copybara import of the project:
• eee7ddc chore: Update version.py (#2628)
• 04677a8 chore(main): release 2.9.0-rc1 (#2618)
• b95f2a8 chore: release 2.9.0-rc1
• 749f8a1 feat: Add gemini-3-flash-preview (gemini-3.1, gemini-3.5, gemini-4 are alread...
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