Bump HotChocolate.AspNetCore from 15.1.15 to 15.1.16

---
updated-dependencies:
- dependency-name: HotChocolate.AspNetCore
  dependency-version: 15.1.16
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]

src/HotChocolateGraphQL.Backend/HotChocolateGraphQL.Backend.csproj

@@ -5,7 +5,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="HotChocolate.AspNetCore" Version="15.1.15" />
+    <PackageReference Include="HotChocolate.AspNetCore" Version="15.1.16" />
     <PackageReference Include="Microsoft.Extensions.Http.Polly" Version="10.0.7" />
   </ItemGroup>