randomPassword: Fix variable declaration to adhere to best practices

[ZikaZaki]

Description

This pull request addresses a coding style and best practice issue related to variable declaration in the randomPassword project codebase, specifically in the bhatshakran\utils.js file. The usage of the let keyword for declaring the capitals variable is inconsistent with best practices, and it can be replaced with the const keyword to improve code readability and maintainability.

Changes Made

• Replaced the usage of let with const when declaring the capitals variable in the provided code snippet.
• Ensured that the capitals array, being declared as const, so it cannot be accidentally reassigned.

Developer Checklist

• Followed guidelines mentioned in the readme file.
• Followed directory structure.
• Starred ⭐ the Repo (Optional)