chore: use spaces for JSON indent in plot graph defaults

[GuneetGill]

Resolves #11471

Description

What is the purpose of this pull request?

This pull request:

• Fixes an EditorConfig lint failure on lib/node_modules/@stdlib/plot/components/svg/graph/lib/defaults.json where lines 2–4 used tab indentation. Per the repository .editorconfig section for [*.{json,json.txt}], JSON must use indent_style = space and indent_size = 2. The file is updated so property lines use two-space indents only (no semantic change to the JSON values).

Related Issues

Does this pull request have any related issues?

This pull request has the following related issues:

• Fix EditorConfig lint errors #11471

Checklist

Please ensure the following tasks are completed before submitting this pull request.

• Read, understood, and followed the contributing guidelines.

AI Assistance

When authoring the changes proposed in this PR, did you use any kind of AI assistance?

• Yes
• No

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@stdlib-js/reviewers

[kgryte]

Ref: #11473

[stdlib-bot]

Thank you for working on this pull request. However, we cannot accept your contribution as the issue this pull request seeks to resolve has already been addressed in a different pull request or commit.

Thank you again for your interest in stdlib, and we look forward to reviewing your future contributions.