Update the package version to 3.1.0

Author: justinyoo

src/Aliencube.AzureFunctions.Extensions.OpenApi/Aliencube.AzureFunctions.Extensions.OpenApi.csproj

@@ -35,7 +35,7 @@
   </PropertyGroup>
 
   <ItemGroup Condition="'$(Configuration)'=='Release'">
-    <PackageReference Include="Aliencube.AzureFunctions.Extensions.OpenApi.Core" Version="3.0.0" />
+    <PackageReference Include="Aliencube.AzureFunctions.Extensions.OpenApi.Core" Version="3.1.0" />
   </ItemGroup>
 
   <ItemGroup>