update google/generative-ai-go to v0.14.0

[JckHoe]

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bumping google-ai dependencies to latest 0.14.0

[JckHoe]

the changes are for

panic: interface conversion: interface {} is []string, not []interface {}

When running the example for tool calls using google-ai

removed the converting slice of interface as it is now already slice of string from the parameter required?

From the example

"required": []string{"location"},

https://github.com/tmc/langchaingo/blob/main/examples/googleai-tool-call-example/googleai-tool-call-example.go#L103

[wangjiancn]

sry, i fix it in #903

[JckHoe]

@wangjiancn awesome, thanks!