remove unused

Author: hjgraca

libraries/tests/AWS.Lambda.Powertools.Metrics.Tests/Handlers/FunctionHandler.cs

@@ -17,7 +17,6 @@
 using System.Globalization;
 using System.Linq;
 using System.Threading.Tasks;
-using AWS.Lambda.Powertools.Common;
 
 namespace AWS.Lambda.Powertools.Metrics.Tests.Handlers;