Update dependency Soenneker.Dictionaries.Singletons to 4.0.4 (#1978)

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

Author: renovate[bot]

src/Soenneker.Utils.HttpClientCache.csproj

@@ -43,7 +43,7 @@
 
     <ItemGroup>
         <PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="10.0.1" />
-        <PackageReference Include="Soenneker.Dictionaries.Singletons" Version="4.0.3" />
+        <PackageReference Include="Soenneker.Dictionaries.Singletons" Version="4.0.4" />
         <PackageReference Include="Soenneker.Dtos.HttpClientOptions" Version="4.0.13" />
         <PackageReference Include="Soenneker.Utils.Runtime" Version="4.0.912" />