Bump Serilog.Sinks.XUnit from 1.0.21 to 2.0.4 (#300)

Bumps [Serilog.Sinks.XUnit](https://github.com/trbenning/serilog-sinks-xunit) from 1.0.21 to 2.0.4.
- [Release notes](https://github.com/trbenning/serilog-sinks-xunit/releases)
- [Commits](https://github.com/trbenning/serilog-sinks-xunit/commits)

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

Directory.Build.targets

@@ -29,7 +29,7 @@
         <PackageReference Update="FluentAssertions" Version="5.10.3" />
         <PackageReference Update="NSubstitute" Version="4.2.1" />
         <PackageReference Update="Serilog.Extensions.Logging" Version="2.0.2" />
-        <PackageReference Update="Serilog.Sinks.XUnit" Version="1.0.21" />
+        <PackageReference Update="Serilog.Sinks.XUnit" Version="2.0.4" />
         <PackageReference Update="XunitXml.TestLogger" Version="2.1.26" />
         <PackageReference Update="coverlet.collector" Version="1.2.0" />
         <PackageReference Update="coverlet.msbuild" Version="2.8.0" />