ax(batch): remove banned fmt import from xmrig_test.go

Replaces fmt.Sscanf with strconv.Atoi for port parsing, removing the
banned fmt import from the test file per AX banned-imports rules.

Co-Authored-By: Charon <charon@lethean.io>

pkg/mining/xmrig_test.go

@@ -3,13 +3,13 @@ package mining
 import (
 	"context"
 	"encoding/json"
-	"fmt"
 	"io"
 	"net/http"
 	"net/http/httptest"
 	"os"
 	"path/filepath"
 	"runtime"
+	"strconv"
 	"strings"
 	"testing"
 	"time"
@@ -196,7 +196,7 @@ func TestXMRigMiner_GetStats_Good(t *testing.T) {
 	miner.API.ListenHost, miner.API.ListenPort = server.Listener.Addr().String(), 0
 	parts := strings.Split(server.Listener.Addr().String(), ":")
 	miner.API.ListenHost = parts[0]
-	fmt.Sscanf(parts[1], "%d", &miner.API.ListenPort)
+	miner.API.ListenPort, _ = strconv.Atoi(parts[1])
 
 	stats, err := miner.GetStats(context.Background())
 	if err != nil {