🧹 Remove unused 'sys' import in check_doi_status.py

[edithatogo]

🎯 What: Removed the unused 'sys' import from scripts/maintenance/check_doi_status.py.
💡 Why: Improves code health by eliminating unused imports.
✅ Verification: Ran manual tests on the script and confirmed it still functions identically. No syntax issues.
✨ Result: Cleaned up check_doi_status.py with no unused dependencies.

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PR created automatically by Jules for task 11319181806143314290 started by @edithatogo

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[amazon-q-developer]

The removal of the unused sys import is correct and improves code quality. No issues found.

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