Update to JSPool 4.0.0

Author: dustinsoftware

src/React.Core/React.Core.csproj

@@ -33,7 +33,7 @@
 
   <ItemGroup>
     <PackageReference Include="JavaScriptEngineSwitcher.Core" Version="3.0.0" />
-    <PackageReference Include="JSPool" Version="4.0.0-beta1" />
+    <PackageReference Include="JSPool" Version="4.0.0" />
     <PackageReference Include="Newtonsoft.Json" Version="9.0.1" />
   </ItemGroup>