Update Elsa versions to 3.4.0-rc2

Upgraded ElsaVersion and ElsaStudioVersion from 3.4.0-rc1 to 3.4.0-rc2 in Directory.Build.props. This ensures the project uses the latest release candidate versions of the Elsa libraries.

Author: sfmskywalker

Directory.Build.props

@@ -27,7 +27,7 @@
         <EnableTrimAnalyzer>true</EnableTrimAnalyzer>
     </PropertyGroup>
     <PropertyGroup>
-        <ElsaVersion>3.4.0-rc1</ElsaVersion>
-        <ElsaStudioVersion>3.4.0-rc1</ElsaStudioVersion>
+        <ElsaVersion>3.4.0-rc2</ElsaVersion>
+        <ElsaStudioVersion>3.4.0-rc2</ElsaStudioVersion>
     </PropertyGroup>
 </Project>