Bump Microsoft.OpenApi.Readers and Microsoft.OpenApi

Bumps [Microsoft.OpenApi.Readers](https://github.com/Microsoft/OpenAPI.NET) and [Microsoft.OpenApi](https://github.com/Microsoft/OpenAPI.NET). These dependencies needed to be updated together.

Updates `Microsoft.OpenApi.Readers` from 1.6.9 to 1.6.13
- [Release notes](https://github.com/Microsoft/OpenAPI.NET/releases)
- [Commits](microsoft/OpenAPI.NET@1.6.9...1.6.13)

Updates `Microsoft.OpenApi` from 1.6.11 to 1.6.13
- [Release notes](https://github.com/Microsoft/OpenAPI.NET/releases)
- [Commits](microsoft/OpenAPI.NET@1.6.11...1.6.13)

---
updated-dependencies:
- dependency-name: Microsoft.OpenApi.Readers
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: Microsoft.OpenApi
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Opc.Ua.ModelCompiler/Opc.Ua.ModelCompiler.csproj

@@ -514,7 +514,7 @@
     <PackageReference Include="CsvHelper" Version="30.0.1" />
     <PackageReference Include="Google.Protobuf" Version="3.25.2" />
     <PackageReference Include="McMaster.Extensions.CommandLineUtils" Version="4.1.0" />
-    <PackageReference Include="Microsoft.OpenApi.Readers" Version="1.6.9" />
+    <PackageReference Include="Microsoft.OpenApi.Readers" Version="1.6.13" />
     <PackageReference Include="OPCFoundation.NetStandard.Opc.Ua.Core" Version="1.5.372.1-rc" />
   </ItemGroup>