Update dependency Soenneker.Extensions.Task to v4 (#155)

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

Author: renovate[bot]

src/Serilog.Sinks.XUnit.Injectable/Serilog.Sinks.XUnit.Injectable.csproj

@@ -42,7 +42,7 @@
 
     <ItemGroup>
         <PackageReference Include="Serilog" Version="4.3.0" />
-        <PackageReference Include="Soenneker.Extensions.Task" Version="3.0.105" />
+        <PackageReference Include="Soenneker.Extensions.Task" Version="4.0.106" />
         <PackageReference Include="Soenneker.Extensions.ValueTask" Version="3.0.95" />
         <PackageReference Include="Soenneker.Utils.AtomicBool" Version="3.0.9" />
         <PackageReference Include="Soenneker.Utils.ReusableStringWriter" Version="3.0.5" />