Bump System.Configuration.ConfigurationManager from 8.0.1 to 9.0.0

Bumps [System.Configuration.ConfigurationManager](https://github.com/dotnet/runtime) from 8.0.1 to 9.0.0.
- [Release notes](https://github.com/dotnet/runtime/releases)
- [Commits](dotnet/runtime@v8.0.1...v9.0.0)

---
updated-dependencies:
- dependency-name: System.Configuration.ConfigurationManager
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

OpenXmlPowerToolsExamples/MarkupSimplifierApp/MarkupSimplifierApp.csproj

@@ -9,7 +9,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="System.Configuration.ConfigurationManager" Version="8.0.1" />
+    <PackageReference Include="System.Configuration.ConfigurationManager" Version="9.0.0" />
   </ItemGroup>
 
   <ItemGroup>