Bump Microsoft.OpenApi from 1.3.2 to 1.4.0 in /src (#1161)

Bumps [Microsoft.OpenApi](https://github.com/Microsoft/OpenAPI.NET) from 1.3.2 to 1.4.0.
- [Release notes](https://github.com/Microsoft/OpenAPI.NET/releases)
- [Commits](microsoft/OpenAPI.NET@1.3.2...1.4.0)

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

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src/AzureIoTHub.Portal/Server/AzureIoTHub.Portal.Server.csproj

@@ -46,7 +46,7 @@
     </PackageReference>
     <PackageReference Include="Microsoft.Extensions.Http.Polly" Version="6.0.8" />
     <PackageReference Include="Microsoft.Graph" Version="4.38.0" />
-    <PackageReference Include="Microsoft.OpenApi" Version="1.3.2" />
+    <PackageReference Include="Microsoft.OpenApi" Version="1.4.0" />
     <PackageReference Include="Microsoft.VisualStudio.Azure.Containers.Tools.Targets" Version="1.17.0" />
     <PackageReference Include="MudBlazor" Version="6.0.15" />
     <PackageReference Include="NetEscapades.AspNetCore.SecurityHeaders" Version="0.17.0" />