Bump Microsoft.AspNetCore.OpenApi from 9.0.2 to 9.0.6

---
updated-dependencies:
- dependency-name: Microsoft.AspNetCore.OpenApi
  dependency-version: 9.0.6
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

src/DemoApi/DemoApi.csproj

@@ -7,7 +7,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.AspNetCore.OpenApi" Version="9.0.2" />
+    <PackageReference Include="Microsoft.AspNetCore.OpenApi" Version="9.0.6" />
   </ItemGroup>
 
 </Project>