Update choosing-the-right-ai-model-for-your-task.md

[TogetherBuilt]

Why:

Fix incorrect data variable reference on line 344 (#37468)

Closes:

#37468

What's being changed (if available, include any code snippets, screenshots, or gifs):

This PR fixes an incorrect data variable reference in choosing-the-right-ai-model-for-your-task.md on line 344. The incorrect variable {% data variables.copilot.copilot_gemini_flash %} is replaced with the correct variable {% data variables.copilot.copilot_gemini_25_pro %}.

Check off the following:

• A subject matter expert (SME) has reviewed the technical accuracy of the content in this PR. In most cases, the author can be the SME. Open source contributions may require an SME review from GitHub staff.
• The changes in this PR meet the docs fundamentals that are required for all content.
• All CI checks are passing and the changes look good in the review environment.

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Copilot reviewed 1 out of 1 changed files in this pull request and generated no comments.

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Source	Review	Production	What Changed
copilot/using-github-copilot/ai-models/choosing-the-right-ai-model-for-your-task.md	fpt ghec	fpt ghec

Key: fpt: Free, Pro, Team; ghec: GitHub Enterprise Cloud; ghes: GitHub Enterprise Server

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[Sharra-writes]

Looks good! 👍 I'll get this merged once all the checks are passing. ✨

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