chore: fix EditorConfig lint errors (issue #11471)

[Ai-chan-0411]

Description

I noticed the automated EditorConfig lint workflow was failing in CI because three defaults.json files under lib/node_modules/@stdlib/plot/components/svg/ used tabs for indentation, while the project's .editorconfig specifies indent_style = space and indent_size = 2 for JSON files.

This PR fixes the indentation in the following files:

• lib/node_modules/@stdlib/plot/components/svg/annotations/line/properties/render-annotation/defaults.json
• lib/node_modules/@stdlib/plot/components/svg/graph/properties/render/defaults.json
• lib/node_modules/@stdlib/plot/components/svg/marks/line/properties/render-marks/defaults.json

Each file had tabs replaced with 2-space indentation to match the EditorConfig rules.

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[Ai-chan-0411]

Thank you for the guidance! I've now added the contributing guidelines acknowledgment to the PR description. I've read and understood the guidelines, including the developer's certificate of origin and the project's contribution terms. Looking forward to the review!

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We noticed that the contributing guidelines acknowledgment is missing from your pull request. Here's what you need to do:

1. Please read our contributing guidelines.

2. Update your pull request description to include this checked box:

   - [x] Read, understood, and followed the [contributing guidelines](https://github.com/stdlib-js/stdlib/blob/develop/CONTRIBUTING.md)

This acknowledgment confirms that you've read the guidelines, which include:

• The developer's certificate of origin
• Your agreement to license your contributions under the project's terms

We can't review or accept contributions without this acknowledgment.

Thank you for your understanding and cooperation. We look forward to reviewing your contribution!

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[Ai-chan-0411]

Thank you @kgryte for reviewing and merging this PR! 🙏 The EditorConfig lint errors are now fixed. Looking forward to contributing more improvements to stdlib.