fixup! Replace ICache interface by a CacheBase class

Fix CacheBase retrieval

Author: fredericDelaporte

src/NHibernate/Async/Engine/BatchFetchQueue.cs

@@ -64,7 +64,7 @@ internal async Task<object[]> GetCollectionBatchAsync(ICollectionPersister colle
 			// List of collection entries that haven't been checked for their existance in the cache. Besides the collection entry,
 			// the index where the entry was found is also stored in order to correctly order the returning keys.
 			var collectionKeys = new List<KeyValuePair<KeyValuePair<CollectionEntry, IPersistentCollection>, int>>(batchSize);
-			var batchableCache = collectionPersister.Cache?.Cache as CacheBase;
+			var batchableCache = collectionPersister.Cache?.GetCacheBase();
 
 			if (!batchLoadableCollections.TryGetValue(collectionPersister.Role, out var map))
 			{

src/NHibernate/Engine/BatchFetchQueue.cs

@@ -235,7 +235,7 @@ internal object[] GetCollectionBatch(ICollectionPersister collectionPersister, o
 			// List of collection entries that haven't been checked for their existance in the cache. Besides the collection entry,
 			// the index where the entry was found is also stored in order to correctly order the returning keys.
 			var collectionKeys = new List<KeyValuePair<KeyValuePair<CollectionEntry, IPersistentCollection>, int>>(batchSize);
-			var batchableCache = collectionPersister.Cache?.Cache as CacheBase;
+			var batchableCache = collectionPersister.Cache?.GetCacheBase();
 
 			if (!batchLoadableCollections.TryGetValue(collectionPersister.Role, out var map))
 			{