Correct @cf/google/gemma-3-12b-it context window to 80k

[ashishdatta]

Summary

Updated @cf/google/gemma-3-12b-it to have the proper context window

Screenshots (optional)

Documentation checklist

• The documentation style guide has been adhered to.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
• Files which have changed name or location have been allocated redirects.

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