🔒 Fix SQL injection vulnerabilities in Quiz_4.py

[tsainez]

🎯 What: Fixed SQL Injection vulnerabilities in insertPC, updatePrinter, and deleteLaptop functions within python/Quiz_4.py.
⚠️ Risk: The previous implementation used string .format() to construct SQL queries, allowing a malicious actor to inject arbitrary SQL statements if user inputs were unescaped, potentially leading to unauthorized data manipulation or deletion.
🛡️ Solution: Refactored the cursor.execute statements to use parameterized queries (?), ensuring that inputs are safely treated as values rather than executable code. Also introduced test_quiz_4.py with an in-memory SQLite setup to verify the functionality of these database modifications.

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PR created automatically by Jules for task 6505424191946188987 started by @tsainez

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