[REF-3016] Upload ID should allow characters

[abulvenz]

Describe the bug
Using an ID like this on_click=State.handle_upload(rx.upload_files(upload_id="cv-upload")),
Will cause a rendering like this:

{files:filesById.cv-upload,upload_id:`cv-upload`}

Expected behavior
Should be rendered as

{files:filesById[`cv-upload`],...

And not cause the error upload is not defined.

Can also be solved by throwing an error and editing the docs, but that would not be the preferred solution.

_REF-3016

[abulvenz]

Thanks for the fix!