Some code cleanup

Author: niemyjski

src/Foundatio.TestHarness/Caching/CacheClientTestsBase.cs

@@ -1901,7 +1901,7 @@ public virtual async Task SetAllExpirationAsync_WithInvalidItems_ValidatesCorrec
             // Null expirations throws ArgumentNullException
             await Assert.ThrowsAsync<ArgumentNullException>(async () =>
                 await cache.SetAllExpirationAsync(null!));
-            
+
             // Items containing empty key throws ArgumentException
             var itemsWithEmptyKey = new Dictionary<string, TimeSpan?> { { "key1", TimeSpan.FromMinutes(5) }, { String.Empty, TimeSpan.FromMinutes(10) } };
             await Assert.ThrowsAsync<ArgumentException>(async () => await cache.SetAllExpirationAsync(itemsWithEmptyKey));

src/Foundatio/Caching/HybridCacheClient.cs

@@ -1,6 +1,4 @@
 using System;
-using System.Collections;
-using System.Collections.Concurrent;
 using System.Collections.Generic;
 using System.Collections.ObjectModel;
 using System.Linq;