Bump Serilog, Serilog.Sinks.File and Serilog.Sinks.Seq in /src

Bumps [Serilog](https://github.com/serilog/serilog), [Serilog.Sinks.File](https://github.com/serilog/serilog-sinks-file) 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.File` from 6.0.0 to 6.0.0
- [Release notes](https://github.com/serilog/serilog-sinks-file/releases)
- [Changelog](https://github.com/serilog/serilog-sinks-file/blob/dev/CHANGES.md)
- [Commits](serilog/serilog-sinks-file@v6.0.0...v6.0.0)

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.File
  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] <[email protected]>

src/Directory.Packages.props

@@ -16,7 +16,7 @@
     <PackageVersion Include="Serilog.Sinks.Console" Version="6.0.0" />
     <PackageVersion Include="Serilog.Formatting.Compact" Version="3.0.0" />
     <PackageVersion Include="Serilog.Sinks.File" Version="6.0.0" />
-    <PackageVersion Include="Serilog.Sinks.Seq" Version="8.0.0" />
+    <PackageVersion Include="Serilog.Sinks.Seq" Version="9.0.0" />
     <PackageVersion Include="Serilog.Sinks.PeriodicBatching" Version="5.0.0" />
     <PackageVersion Include="Verify.DiffPlex" Version="3.1.2" />
     <PackageVersion Include="Verify.NServiceBus" Version="10.3.4" />