Fix code scanning alert no. 12: Insecure randomness

[priyankarpal]

Fixes https://github.com/reactplay/react-play/security/code-scanning/12

To fix the problem, we need to replace the use of Math.random() with a cryptographically secure random number generator. In a browser environment, window.crypto.getRandomValues is the appropriate choice. This method generates cryptographically secure random values, making it much harder for an attacker to predict the generated passwords.

• Replace the randomNumberGenerator function to use window.crypto.getRandomValues instead of Math.random().
• Ensure the generated random number is within the specified limit without introducing bias.

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