chore: replace var with let/const in isRealPathSafe

[fengmk2]

Summary

• Replace var with let/const in isRealPathSafe() in lib/utils.js to fix 6 eslint no-var errors introduced by the GHSA-4c3q-x735-j3r5 fix.

Test plan

• npm run lint passes with 0 errors

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[gemini-code-assist]

Code Review

This pull request updates lib/utils.js by replacing var declarations with const and let to align with modern JavaScript standards. I have no feedback to provide as there were no review comments and the changes are appropriate.

[github-actions]

🎉 This PR is included in version 1.10.6 🎉

The release is available on:

• npm package (@release-1.x dist-tag)
• GitHub release

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