[CI-19] Updated better-auth to 1.4.9

[Ansi007]

Pull Request Title

Provide a concise title that clearly summarizes your changes.
Example: [CI-21] Updated better-auth to 1.4.9.

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Description

Updated better-auth to 1.4.9 (latest version as of Dec 27, older version had vulnerabilities)

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Type of Change

Select all that apply:

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that could cause existing functionality to not work as expected)
• Refactor / Chore (code cleanup, dependencies, tooling, etc.)

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How Has This Been Tested?

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Breaking Changes

If applicable, describe what breaks and how to migrate.
If none, write: N/A.

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Checklist

• My code follows the project’s code style.
• I have run all linter.
• I have checked that my changes do not introduce breaking changes.
• I have commented my code where needed, especially complex logic.

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Screenshots / Videos

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Additional Notes

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• Deployment notes
• New dependencies or migrations
• Performance considerations
• Known limitations or follow-ups
  If none, write: N/A.

[github-actions]

✅ All changed files passed linting checks!