Fix: Pointer Error And Change Type Hardcoded To "openai.AssistantTool…

[Lenstack]

…TypeFunction" in openai.go

Pull Request Template

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Description

Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change.

Fixes # (issue)

Type of change

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• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
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[henomis]

@Lenstack this PR is broken, I don't understand your intent.

[henomis]

As there's been no follow-up on the requested changes, I'm closing this PR and the related issue.