Bump HotChocolate.AspNetCore from 13.9.7 to 13.9.11 in /src

Bumps [HotChocolate.AspNetCore](https://github.com/ChilliCream/graphql-platform) from 13.9.7 to 13.9.11.
- [Release notes](https://github.com/ChilliCream/graphql-platform/releases)
- [Commits](ChilliCream/graphql-platform@13.9.7...13.9.11)

---
updated-dependencies:
- dependency-name: HotChocolate.AspNetCore
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

src/HotChocolateGraphQL.Backend/HotChocolateGraphQL.Backend.csproj

@@ -6,7 +6,7 @@
 
   <ItemGroup>
     <PackageReference Include="CommunityToolkit.Maui" Version="9.0.1" />
-    <PackageReference Include="HotChocolate.AspNetCore" Version="13.9.7" />
+    <PackageReference Include="HotChocolate.AspNetCore" Version="13.9.11" />
     <PackageReference Include="Microsoft.Extensions.Http.Polly" Version="8.0.7" />
   </ItemGroup>