qbittorrent/exporter: Replace deprecated calls

modules/qbittorrent/exporter/qbittorrent_exporter.go

@@ -7,7 +7,7 @@ package main
 import (
 	"context"
 	"encoding/json"
-	"io/ioutil"
+	"io"
 	"log"
 	"net"
 	"net/http"
@@ -119,7 +119,7 @@ func (c ApiClient) doRequest(group string, method string, parameters url.Values)
 		log.Println(err)
 		return []byte{}, err
 	}
-	bodyBytes, err := ioutil.ReadAll(res.Body)
+	bodyBytes, err := io.ReadAll(res.Body)
 	if err != nil {
 		return []byte{}, err
 	}