Replace manual null checks with ArgumentNullException.ThrowIfNull()

[devlead]

Replace traditional if-null-then-throw patterns with the more concise
ArgumentNullException.ThrowIfNull() method introduced in .NET 6/C# 10.

[github-actions]

🎉 This issue has been resolved in version v6.0.0 🎉

The release is available on:

• GitHub Release
• .NET Tool

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