Added net 9.0 tfm

Author: niemyjski

build/common.props

@@ -1,7 +1,7 @@
 <Project>
 
   <PropertyGroup>
-    <TargetFrameworks>netstandard2.0;net8.0</TargetFrameworks>
+    <TargetFrameworks>netstandard2.0;net8.0;net9.0</TargetFrameworks>
     <Product>Foundatio</Product>
     <Description>Pluggable foundation blocks for building distributed apps.</Description>
     <PackageProjectUrl>https://github.com/FoundatioFx/Foundatio</PackageProjectUrl>