Reconfigure stdin encoding to UTF-8

[metab0t]

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Description

Please describe your PR here.

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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[cderv]

Sorry for the delay on this one !

[Copilot]

Pull request overview

This PR addresses a UTF-8 encoding issue on Windows when reading JSON input from stdin. The problem occurs when processing documents containing non-ASCII characters (e.g., Chinese), which causes JSON parsing to fail due to incorrect encoding.

Changes:

• Added UTF-8 encoding reconfiguration for stdin before reading JSON input

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[cderv]

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