Restore blank lines

These lines were removed unexpectedly by the automated file header code
fix.
\n\nCommit migrated from dotnet/extensions@738f2d6

Author: sharwell

src/Caching/StackExchangeRedis/test/Infrastructure/RedisXunitTestExecutor.cs

@@ -1,6 +1,7 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
+
 //using System;
 //using System.Reflection;
 //using Xunit.Abstractions;

src/Caching/StackExchangeRedis/test/Infrastructure/RedisXunitTestFramework.cs

@@ -1,6 +1,7 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
+
 //using System.Reflection;
 //using Xunit;
 //using Xunit.Abstractions;