chore(deps): update dependency microsoft.aspnetcore.openapi to v9

Author: renovate-bot

Directory.Packages.props

@@ -16,7 +16,7 @@
     <PackageVersion Include="Humanizer" Version="2.14.1" />
     <PackageVersion Include="MessagePack" Version="3.1.1" />
     <PackageVersion Include="Microsoft.AspNetCore.Mvc.Testing" Version="9.0.0" />
-    <PackageVersion Include="Microsoft.AspNetCore.OpenApi" Version="8.0.11" />
+    <PackageVersion Include="Microsoft.AspNetCore.OpenApi" Version="9.0.0" />
     <PackageVersion Include="Microsoft.AspNetCore.TestHost" Version="9.0.0" />
     <PackageVersion Include="Microsoft.Bcl.AsyncInterfaces" Version="9.0.0" />
     <PackageVersion Include="Microsoft.Build.Utilities.Core" Version="17.12.6" />