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It looks like the best modern answer is eventually those libraries moved to a NuGet package, Microsoft.Xaml.Behaviors.Wpf. The namespaces might've been shuffled around, so you might have to update the schema reference in your XML, but it seems like that one is the correct one.
There's a host of "community toolkits" for various XAML frameworks and it's possible I"m a bit out of date and behaviors moved to one of those. I can't find one for WPF, but for example this is the MAUI one and it has an extensive collection of behaviors. (Those only work in MAUI though, "for reasons" there's not one consistent way to cross-framework develop behaviors.)