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 1.6.22 to 1.6.23
- [Release notes](https://github.com/Microsoft/OpenAPI.NET/releases)
- [Commits](microsoft/OpenAPI.NET@1.6.22...1.6.23)

Updates `Microsoft.OpenApi.Readers` from 1.6.22 to 1.6.23
- [Release notes](https://github.com/Microsoft/OpenAPI.NET/releases)
- [Commits](microsoft/OpenAPI.NET@1.6.22...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] <[email protected]>

Testing/Acceptance/GenHTTP.Testing.Acceptance.csproj

@@ -40,8 +40,8 @@
 
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
 
-        <PackageReference Include="Microsoft.OpenApi" Version="1.6.22" />
-        <PackageReference Include="Microsoft.OpenApi.Readers" Version="1.6.22" />
+        <PackageReference Include="Microsoft.OpenApi" Version="1.6.23" />
+        <PackageReference Include="Microsoft.OpenApi.Readers" Version="1.6.23" />
 
         <PackageReference Include="MSTest.TestAdapter" Version="3.6.4" />
         <PackageReference Include="MSTest.TestFramework" Version="3.6.4" />