Potential fix for code scanning alert no. 39: Missing rate limiting

[xDido]

Potential fix for https://github.com/advanced-computer-lab-2023/CodeMedics-Clinic/security/code-scanning/39

To address the issue, we will introduce rate limiting to the /resetPassword route using the express-rate-limit package. This middleware will limit the number of requests a client can make to this endpoint within a specified time window, mitigating the risk of DoS attacks.

Steps to 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. Configure a rate limiter with appropriate settings (e.g., maximum requests and time window).
4. Apply the rate limiter specifically to the /resetPassword route.

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