Potential fix for code scanning alert no. 38: Missing rate limiting

[xDido]

Potential fix for https://github.com/advanced-computer-lab-2023/CodeMedics-Clinic/security/code-scanning/38

To fix the issue, we will add rate limiting to the LoginController.login route using the express-rate-limit package. This package allows us to define a rate-limiting policy, such as the maximum number of requests allowed within a specific time window.

Steps to implement the fix:

1. Install the express-rate-limit package if it is not already installed.
2. Import the express-rate-limit package in the file.
3. Define a rate-limiting middleware with appropriate settings (e.g., maximum requests per minute).
4. Apply the rate-limiting middleware specifically to the /login route.

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