Update dependency Soenneker.Utils.SingletonDictionary to 3.0.588 (#1024)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

src/Soenneker.Utils.HttpClientCache.csproj

@@ -38,6 +38,6 @@
         <None Include="..\icon.png" Pack="true" PackagePath="\" />
         <PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="9.0.0" />
         <PackageReference Include="Soenneker.Utils.Runtime" Version="3.0.418" />
-        <PackageReference Include="Soenneker.Utils.SingletonDictionary" Version="3.0.585" />
+        <PackageReference Include="Soenneker.Utils.SingletonDictionary" Version="3.0.588" />
     </ItemGroup>
 </Project>