chore(deps): update dependency splat to 19.4.0 (#505)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

src/Directory.Packages.props

@@ -6,7 +6,7 @@
   <ItemGroup>
     <!-- Central package versions -->
     <PackageVersion Include="punchclock" Version="6.0.1" />
-    <PackageVersion Include="Splat" Version="19.3.1" />
+    <PackageVersion Include="Splat" Version="19.4.0" />
     <PackageVersion Include="System.Net.Http" Version="4.3.4" />
     <PackageVersion Include="Akavache.SystemTextJson" Version="12.0.12" />
     <PackageVersion Include="ReactiveUI.Testing" Version="23.2.27" />