docs(ai): change model version in examples from gemini-1.5 to gemini-2.5

[AydanBeytulov]

gemini-1.5 is not working anymore

[vercel]

@AydanBeytulov is attempting to deploy a commit to the Invertase Team on Vercel.

A member of the Team first needs to authorize it.

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[mikehardy]

indeed! looks like a good change thanks

If you could follow the instructions / link in the CLA license bot's comments and get that check to go green we can merge this

Cheers

[mikehardy]

@AydanBeytulov 👋 a gentle nudge that we need the CLA signed even for small things, trivial though they may seem. Thanks

[github-actions]

Hello 👋, this PR has been opened for more than 14 days with no activity on it.

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