Update dependency Splat to v19

Author: renovate[bot]

SidebarDiagnostics/SidebarDiagnostics.csproj

@@ -65,7 +65,7 @@
     <PackageReference Include="OxyPlot.Wpf" Version="2.2.0" />
     <PackageReference Include="OxyPlot.Wpf.Shared" Version="2.2.0" />
     <PackageReference Include="SharpCompress" Version="0.41.0" />
-    <PackageReference Include="Splat" Version="17.1.1" />
+    <PackageReference Include="Splat" Version="19.2.1" />
     <PackageReference Include="System.Data.DataSetExtensions" Version="4.5.0" />
     <PackageReference Include="TaskScheduler" Version="2.12.2" />
     <PackageReference Include="gong-wpf-dragdrop" Version="4.0.0" />