Bump Microsoft.OpenApi and Microsoft.OpenApi.Readers

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

Updates `Microsoft.OpenApi` from 1.6.19 to 1.6.23
- [Release notes](https://github.com/Microsoft/OpenAPI.NET/releases)
- [Commits](microsoft/OpenAPI.NET@1.6.19...1.6.23)

Updates `Microsoft.OpenApi.Readers` from 1.6.19 to 1.6.23
- [Release notes](https://github.com/Microsoft/OpenAPI.NET/releases)
- [Commits](microsoft/OpenAPI.NET@1.6.19...1.6.23)

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

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

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

@@ -458,8 +458,8 @@
   <ItemGroup>
     <PackageReference Include="CsvHelper" Version="33.0.1" />
     <PackageReference Include="McMaster.Extensions.CommandLineUtils" Version="4.1.1" />
-    <PackageReference Include="Microsoft.OpenApi" Version="1.6.19" />
-    <PackageReference Include="Microsoft.OpenApi.Readers" Version="1.6.19" />
+    <PackageReference Include="Microsoft.OpenApi" Version="1.6.23" />
+    <PackageReference Include="Microsoft.OpenApi.Readers" Version="1.6.23" />
     <PackageReference Include="Newtonsoft.Json.Schema" Version="4.0.1" />
     <PackageReference Include="NJsonSchema" Version="11.0.2" />
     <PackageReference Include="NJsonSchema.CodeGeneration.TypeScript" Version="11.0.2" />