🧹 Remove unused import in test_calc_test.py

[ManupaKDU]

🎯 What: Removed the unused import sys statement from Learning/Part-1/Python/test_calc_test.py.
💡 Why: To improve code maintainability and readability by eliminating namespace clutter and dead code. The sys module was imported but never explicitly used in the file, as sys.stdout is dynamically resolved by unittest.mock.patch using string targeting.
✅ Verification: Verified by confirming the modification preserved existing functionality with zero regressions. All pre-commit tasks, including test runs and syntax verification, passed flawlessly.
✨ Result: Improved code cleanliness while preserving exactly the same behavior.

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PR created automatically by Jules for task 9193950407952403630 started by @ManupaKDU

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