Update resource list

Author: Autogenerator Pipeline

generator/resources.json

@@ -6429,10 +6429,12 @@
     "2021-03-01"
   ],
   "Microsoft.StoragePool/diskPools": [
-    "2020-03-15-preview"
+    "2020-03-15-preview",
+    "2021-04-01-preview"
   ],
   "Microsoft.StoragePool/diskPools/iscsiTargets": [
-    "2020-03-15-preview"
+    "2020-03-15-preview",
+    "2021-04-01-preview"
   ],
   "Microsoft.StorageSync/storageSyncServices": [
     "2017-06-05-preview",