Bump Serilog and Serilog.Sinks.Seq in /source (#94)

Bumps [Serilog](https://github.com/serilog/serilog) and [Serilog.Sinks.Seq](https://github.com/datalust/serilog-sinks-seq). These dependencies needed to be updated together.

Updates `Serilog` from 4.2.0 to 4.2.0
- [Release notes](https://github.com/serilog/serilog/releases)
- [Commits](serilog/serilog@v4.2.0...v4.2.0)

Updates `Serilog.Sinks.Seq` from 8.0.0 to 9.0.0
- [Release notes](https://github.com/datalust/serilog-sinks-seq/releases)
- [Commits](datalust/serilog-sinks-seq@v8.0.0...v9.0.0)

---
updated-dependencies:
- dependency-name: Serilog
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: Serilog.Sinks.Seq
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

source/TeamCityBuildStatsScraper.csproj

@@ -16,7 +16,7 @@
         <PackageReference Include="Serilog" Version="4.2.0" />
         <PackageReference Include="Serilog.Extensions.Hosting" Version="9.0.0" />
         <PackageReference Include="Serilog.Sinks.Console" Version="6.0.0" />
-        <PackageReference Include="Serilog.Sinks.Seq" Version="8.0.0" />
+        <PackageReference Include="Serilog.Sinks.Seq" Version="9.0.0" />
         <PackageReference Include="TeamCitySharp-forked-mavezeau" Version="2.0.17" />
     </ItemGroup>