fix(deps): update dependency chat_gpt_sdk to v3.1.5

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
chat_gpt_sdk (source)	dependencies	minor	3.0.8 → 3.1.5

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Release Notes

redevRx/Flutter-ChatGPT (chat_gpt_sdk)

v3.1.5

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• add instructions in SpeechRequest

v3.1.4

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• Added support for image data i.e, type (image_file, image_url) in content v2

3.1.5

• add instructions in SpeechRequest

v3.1.3

• Implement support for streaming responses from OpenAI on web platform
  • Merge Code from contributors
  • Added json_schema support to ResponseFormat

v3.1.2

• Update sdk
  • remove path provider

v3.1.1

• Update sdk

v3.1.0

Compare Source

• Add Gpt 4o mini
• Add Doc API version 2 (Assistants v2)

v3.0.9

Compare Source

• Assistants v2
• Deprecate API

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