Potential fix for code scanning alert no. 1: Use of a broken or weak cryptographic hashing algorithm on sensitive data

[ModusOperandom]

Potential fix for https://github.com/ModusOperandom/skills-introduction-to-repository-management/security/code-scanning/1

To fix the issue, we need to replace the insecure hashlib.sha256 hashing function with a secure password hashing algorithm. The best approach is to use a library like argon2-cffi, which implements the Argon2 password hashing algorithm. Argon2 is computationally expensive, includes built-in salting, and is specifically designed for password hashing.

Steps to fix:

1. Install the argon2-cffi library if it is not already installed.
2. Replace the hash_password function to use Argon2 for hashing passwords.
3. Update the login function to verify the password using Argon2's verify method instead of directly comparing hashed values.

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