Upload tweak

[pngwn]

Description

• Tiny css tweak to uplaod progress, to ensure it is always centered. Only an issue in custom components.
• Add engines field for node and pnpm, to ensure people are using the correct versions.

Closes: #(issue)

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Tests

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[gradio-pr-bot]

🪼 branch checks and previews

•	Name	Status	URL
	Spaces	ready!	Spaces preview
	Website	ready!	Website preview
	Storybook	ready!	Storybook preview
	Visual tests	all good!	Build review
🦄	Changes	detected!	Details

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Install Gradio from this PR

pip install https://gradio-builds.s3.amazonaws.com/d338ffe864dfe5e7b6105c3264a03861f1caff31/gradio-4.16.0-py3-none-any.whl

Install Gradio Python Client from this PR

pip install "gradio-client @ git+https://github.com/gradio-app/gradio@d338ffe864dfe5e7b6105c3264a03861f1caff31#subdirectory=client/python"

[gradio-pr-bot]

🦄 change detected

This Pull Request includes changes to the following packages.

Package	Version
@gradio/upload	patch
gradio	patch

• Maintainers can select this checkbox to manually select packages to update.

With the following changelog entry.

Upload tweak

Maintainers or the PR author can modify the PR title to modify this entry.

Something isn't right?

• Maintainers can change the version label to modify the version bump.
• If the bot has failed to detect any changes, or if this pull request needs to update multiple packages to different versions or requires a more comprehensive changelog entry, maintainers can update the changelog file directly.

[pngwn]

pnpm version in ci didn't satisfy the check 🙈

fixed now

[abidlabs]

cool thanks @pngwn!