🔒 Fix SQL Injection vulnerabilities in Quiz_4.py

[tsainez]

🎯 What: Fixed SQL injection vulnerabilities in deleteLaptop, insertPC, and updatePrinter functions in python/Quiz_4.py.
⚠️ Risk: Using .format() for SQL queries exposes the application to SQL injection, potentially allowing attackers to execute arbitrary SQL commands, modify, or delete database contents.
🛡️ Solution: Replaced string interpolation (.format()) with parameterized SQL queries (?) in all database execute calls within Quiz_4.py. Also added test_quiz_4.py with unit tests utilizing an in-memory SQLite database to ensure the methods function correctly and protect against malicious inputs. Included __pycache__/ and *.pyc in .gitignore to prevent committing binary cache files.

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PR created automatically by Jules for task 5754517396399902732 started by @tsainez

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