Reconfigure stdin encoding to UTF-8

[metab0t]

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Description

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On Windows, we need to use utf-8 to read the json correctly.

This one line change fixes the json load error on Windows writingdocuments containing Chinese for me.

Checklist

I have (if applicable):

• filed a contributor agreement.
• referenced the GitHub issue this PR closes
• updated the appropriate changelog in the PR
• ensured the present test suite passes
• added new tests
• created a separate documentation PR in Quarto's website repo and linked it to this PR

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