Rename WindowsFact to WindowsFactAttribute to follow best practices

[devlead]

cake/src/Cake.Testing.Xunit/WindowsFact.cs

Line 11 in fdb906a

public sealed class WindowsFact : FactAttribute

[cake-build-bot]

🎉 This issue has been resolved in version v3.0.0 🎉

The release is available on:

• GitHub Release
• .NET Tool

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