FusionCache.CompleteBackgroundFactory => Using async/await instead of…

… ".Result" (#258)

* FusionCache.CompleteBackgroundFactory => Using "GetAwaiter().GetResult()" instead of ".Result"

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Co-authored-by: Jody Donetti <indastria@gmail.com>

src/ZiggyCreatures.FusionCache/FusionCache.cs

@@ -401,7 +401,7 @@ private void CompleteBackgroundFactory<TValue>(string operationId, string key, F
 					options.ReThrowBackplaneExceptions = false;
 
 					// ADAPTIVE CACHING UPDATE
-					var lateEntry = FusionCacheMemoryEntry<TValue>.CreateFromOptions(antecedent.Result, options, false, ctx.LastModified, ctx.ETag, null);
+					var lateEntry = FusionCacheMemoryEntry<TValue>.CreateFromOptions(antecedent.GetAwaiter().GetResult(), options, false, ctx.LastModified, ctx.ETag, null);
 
 					var mca = GetCurrentMemoryAccessor(options);
 					if (mca is not null)