fix: upgrade babel version

[Mercy811]

Summary

Updates @babel/runtime to version 7.28.6 to resolve a known moderate security vulnerability (npm advisory 1104000) related to inefficient RegExp complexity. This ensures the SDK's production dependencies are free of known vulnerabilities.

Checklist

• Does your PR title have the correct title format?
• Does your PR have a breaking change?: No

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[cursor]

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[macroscopeapp]

Upgrade @babel/runtime to ^7.28.6 and switch GitHub Actions node_modules caching to actions/cache@v4 across CI workflows

Bumps @babel/runtime to ^7.28.6 in package.json and updates CI workflows to use actions/cache@v4 for node_modules caching.

📍Where to Start

Start with the dependency change in package.json, then review the cache step updates in ./github/workflows/test.yml.

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Macroscope summarized 86532ed.