#5571: fixed errors.As usage for pointer

Author: Shawn Reuland

ingest/ledgerbackend/rpc_backend.go

@@ -253,7 +253,7 @@ func (b *RPCLedgerBackend) getBufferedLedger(ctx context.Context, sequence uint3
 
 	ledgers, err := b.client.GetLedgers(ctx, req)
 	if err != nil {
-		var rpcErr jrpc2.Error
+		var rpcErr *jrpc2.Error
 		if errors.As(err, &rpcErr) &&
 			// rpc request duration limits may trigger these errors, it is acceptable to retry
 			(rpcErr.Code == rpcErrRequestExceededProcessingLimitThreshold ||