fix: assembly signing build warning

Author: bcuff

src/Elasticsearch.Net.Aws/Elasticsearch.Net.Aws/Properties/AssemblyInfo.cs

@@ -10,8 +10,6 @@
 // The following GUID is for the ID of the typelib if this project is exposed to COM
 [assembly: Guid("0de39cec-a00f-409a-9d45-aafa31c77ed9")]
 
-#if !DEBUG
-[assembly: AssemblyKeyFile("key.snk")]
-#else
+#if DEBUG
 [assembly: InternalsVisibleTo("ElasticSearch.Net.Aws.Tests")]
 #endif