fix lint again

Signed-off-by: Ben Ye <benye@amazon.com>

Author: yeya24

pkg/ruler/notifier.go

@@ -4,14 +4,14 @@ import (
 	"context"
 	"flag"
 	"fmt"
-	"github.com/prometheus/client_golang/prometheus"
 	"net/url"
 	"regexp"
 	"strings"
 	"sync"
 
 	gklog "github.com/go-kit/log"
 	"github.com/go-kit/log/level"
+	"github.com/prometheus/client_golang/prometheus"
 	config_util "github.com/prometheus/common/config"
 	"github.com/prometheus/common/model"
 	"github.com/prometheus/prometheus/config"