core: silence txpool reorg warning (annoying on import) (#15725)

core/tx_pool.go

@@ -360,7 +360,7 @@ func (pool *TxPool) reset(oldHead, newHead *types.Header) {
 		newNum := newHead.Number.Uint64()
 
 		if depth := uint64(math.Abs(float64(oldNum) - float64(newNum))); depth > 64 {
-			log.Warn("Skipping deep transaction reorg", "depth", depth)
+			log.Debug("Skipping deep transaction reorg", "depth", depth)
 		} else {
 			// Reorg seems shallow enough to pull in all transactions into memory
 			var discarded, included types.Transactions