Removed unnecessary changes

Author: David Peck

Our.Umbraco.TagHelpers/UmbracoCacheTagHelper.cs

@@ -2,7 +2,6 @@
 using Microsoft.AspNetCore.Mvc.TagHelpers.Cache;
 using Microsoft.AspNetCore.Razor.TagHelpers;
 using Our.Umbraco.TagHelpers.Services;
-using System.Collections.Generic;
 using System.Text.Encodings.Web;
 using System.Threading.Tasks;
 using Umbraco.Cms.Core;
@@ -63,7 +62,7 @@ public override async Task ProcessAsync(TagHelperContext context, TagHelperOutpu
                         // and clear all items out in that collection with our notifications on publish
                         var cacheKey = new CacheTagKey(this, context);
                         var key = cacheKey.GenerateKey();
-                        _ = cacheKey.GenerateHashedKey();
+                        var hashedKey = cacheKey.GenerateHashedKey();
                         _cacheKeys.CacheKeys.TryAdd(key, cacheKey);
                     }
                 }