chore(deps): update dependency splat to 19.4.0

Author: renovate[bot]

src/Directory.Packages.props

@@ -28,7 +28,7 @@
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.5.1" />
     <PackageVersion Include="System.Formats.Asn1" Version="10.0.8" />
     <PackageVersion Include="PublicApiGenerator" Version="11.5.4" />
-    <PackageVersion Include="Splat" Version="19.3.1" />
+    <PackageVersion Include="Splat" Version="19.4.0" />
     <PackageVersion Include="ReactiveUI" Version="23.2.27" />
     <PackageVersion Include="ReactiveUI.Maui" Version="23.2.27" />
     <PackageVersion Include="System.Reactive" Version="6.1.0" />