Dispose command line args enumerator

src/Microsoft.Extensions.Configuration.CommandLine/CommandLineConfigurationProvider.cs

@@ -46,7 +46,8 @@ namespace Microsoft.Extensions.Configuration.CommandLine
             var data = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
             string key, value;
 
-            var enumerator = Args.GetEnumerator();
+            using (var enumerator = Args.GetEnumerator())
+            {
                 while (enumerator.MoveNext())
                 {
                     var currentArg = enumerator.Current;
@@ -128,6 +129,7 @@ namespace Microsoft.Extensions.Configuration.CommandLine
                     // Override value when key is duplicated. So we always have the last argument win.
                     data[key] = value;
                 }
+            }
 
             Data = data;
         }