Potential fix for code scanning alert no. 29: Missed opportunity to use Where

[clairernovotny]

Potential fix for https://github.com/Humanizr/Humanizer/security/code-scanning/29

To fix the problem, refactor the AllCapitals method to use LINQ's All method for checking whether all characters in the string are uppercase, replacing the current foreach loop and manual return logic. This involves replacing lines 38–46 in AllCapitals with a simple one-liner using input.All(char.IsUpper). You will need to ensure that the file's namespace includes using System.Linq; to access the LINQ methods. No changes to how the method is called elsewhere are needed, as return type and logic remain unchanged.

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Pull Request Overview

This pull request refactors the AllCapitals method to use LINQ's All method instead of a manual foreach loop, improving code readability and following LINQ best practices. This addresses a code scanning alert about a missed opportunity to use LINQ's Where method (though the actual improvement uses All).

• Replaced foreach loop with LINQ All method for checking if all characters are uppercase
• Added using System.Linq; directive to enable LINQ functionality
• Simplified the method from 9 lines to a single expression

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