Bump System.CodeDom from 8.0.0 to 9.0.0 (#265)

Bumps [System.CodeDom](https://github.com/dotnet/runtime) from 8.0.0 to 9.0.0.
- [Release notes](https://github.com/dotnet/runtime/releases)
- [Commits](dotnet/runtime@v8.0.0...v9.0.0)

---
updated-dependencies:
- dependency-name: System.CodeDom
  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>

src/Directory.Packages.props

@@ -7,7 +7,7 @@
   <ItemGroup>
     <PackageVersion Include="Akka.Cluster.TestKit" Version="1.5.35" />
     <PackageVersion Include="TeamCity.ServiceMessages" Version="4.1.1" />
-    <PackageVersion Include="System.CodeDom" Version="8.0.0" />
+    <PackageVersion Include="System.CodeDom" Version="9.0.0" />
     <PackageVersion Include="System.Runtime.Loader" Version="4.3.0" />
     <PackageVersion Include="xunit.runner.utility" Version="2.8.1" />
   </ItemGroup>