fix: remove exhaustive-deps suppression in CourseReviews

[pharwasz]

Closes #985

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Summary

This PR fixes the React Hooks exhaustive-deps warning in CourseReviews.tsx.

Changes

• Added getHelpfulCount to the useMemo dependency array.
• Removed the react-hooks/exhaustive-deps suppression comment.
• Preserved existing behavior since getHelpfulCount is a stable Zustand action.

Verification

• ✅ Added getHelpfulCount to the dependency array.
• ✅ Removed the ESLint suppression.
• ✅ Confirmed getHelpfulCount is a stable Zustand action.
• ✅ Editor diagnostics report no errors.
• ✅ git diff --check passed.
• ⚠️ ESLint could not be run locally because project dependencies are not installed (node_modules unavailable).

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[RUKAYAT-CODER]

Thank you for contributing to the project.

[pharwasz]

Thank you for contributing to the project.

thanks for the opportunity