Update RulesEngine.csproj to 5.0.4 version for nuget publish (#639)

Author: pbhal

src/RulesEngine/RulesEngine.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <TargetFrameworks>net8.0;net6.0;netstandard2.0</TargetFrameworks>
-    <Version>5.0.3.1</Version>
+    <Version>5.0.4</Version>
     <Copyright>Copyright (c) Microsoft Corporation.</Copyright>
     <PackageLicenseFile>LICENSE</PackageLicenseFile>
     <PackageProjectUrl>https://github.com/microsoft/RulesEngine</PackageProjectUrl>