templates(cloudflare): add type casting for fixing the incompatible raw server build

[dario-piotrowicz]

Closes: #10068

Testing Strategy:

This PR simply updates a template file, so for testing it I just followed the steps in #10068 and updated the functions/[[path]].ts file there with this

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[github-actions]

Thank you for opening this pull request, and our apologies we haven't gotten around to it yet!

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