Bump Microsoft.OpenApi from 1.2.3 to 1.3.1

Bumps [Microsoft.OpenApi](https://github.com/Microsoft/OpenAPI.NET) from 1.2.3 to 1.3.1.
- [Release notes](https://github.com/Microsoft/OpenAPI.NET/releases)
- [Commits](microsoft/OpenAPI.NET@1.2.3...1.3.1)

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

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

Author: dependabot[bot]

src/OoasGui/OoasGui.csproj

@@ -17,7 +17,7 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.CSharp" Version="4.7.0" />
     <PackageReference Include="Microsoft.OData.Edm" Version="7.10.0" />
-    <PackageReference Include="Microsoft.OpenApi" Version="1.2.3" />
+    <PackageReference Include="Microsoft.OpenApi" Version="1.3.1" />
     <PackageReference Include="System.Data.DataSetExtensions" Version="4.5.0" />
   </ItemGroup>
 </Project>

tool/UpdateDocs/UpdateDocs.csproj

@@ -13,6 +13,6 @@
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="Microsoft.OData.Edm" Version="7.10.0" />
-    <PackageReference Include="Microsoft.OpenApi" Version="1.2.3" />
+    <PackageReference Include="Microsoft.OpenApi" Version="1.3.1" />
   </ItemGroup>
 </Project>