Update dependency Soenneker.SemanticKernel.Pool to 3.0.19

Author: renovate[bot]

src/Soenneker.SemanticKernel.Pool.Gemini.csproj

@@ -43,7 +43,7 @@
 
     <ItemGroup>
         <PackageReference Include="Microsoft.SemanticKernel.Connectors.Google" Version="1.51.0-alpha" />
-        <PackageReference Include="Soenneker.SemanticKernel.Pool" Version="3.0.17" />
+        <PackageReference Include="Soenneker.SemanticKernel.Pool" Version="3.0.19" />
         <PackageReference Include="Soenneker.Utils.HttpClientCache" Version="3.0.1692" />
     </ItemGroup>
 </Project>