fix : replaced deprecated datetime.utcnow with timezone-aware alternative

[tmdeveloper007]

Summary of What Has Been Done

Replaced all 10 occurrences of datetime.utcnow() in src/utils/privacy.py with datetime.now(timezone.utc) to address the Python 3.12 deprecation of datetime.utcnow().

Changes Made

• Updated import: from datetime import datetime -> from datetime import datetime, timezone
• Replaced all datetime.utcnow() calls with datetime.now(timezone.utc)

Impact it Made

• Forward-compatibility with Python 3.12 and beyond
• Eliminates deprecation warnings in newer Python versions
• Follows current Python best practices for UTC datetime handling

Closes #1339

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