refactor(build): Remove Serializable attribute from OurMSBuildSettings

- Remove [Serializable] attribute from OurMSBuildSettings class
- Simplify class definition by removing unnecessary serialization marker
- Maintain compatibility with existing MSBuildSettings implementation

Author: jddcef

build/NukePlusPlus/OurMSBuildSettings.cs

@@ -8,7 +8,6 @@
 namespace NukePlusPlus {
 	[PublicAPI]
 	[ExcludeFromCodeCoverage]
-	[Serializable]
 	public class OurMSBuildSettings : MSBuildSettings {
 		protected override Arguments ConfigureProcessArguments(Arguments arguments) {
 			var args = base.ConfigureProcessArguments(arguments);