Remove pre-release reference for Microsoft.CSharp (#4453) (#4455)

Remove 4.6.0-preview3.19128.7 and bump to GA release 4.6.0

Co-authored-by: Stuart Cam <[email protected]>

Author: github-actions[bot]

src/Elasticsearch.Net/Elasticsearch.Net.csproj

@@ -20,7 +20,7 @@
 
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="Microsoft.CSharp" Version="4.6.0-preview3.19128.7" />
+    <PackageReference Include="Microsoft.CSharp" Version="4.6.0" />
     <PackageReference Include="System.Buffers" Version="4.5.0" />
     <PackageReference Include="System.Diagnostics.DiagnosticSource" Version="4.5.1" />