Fix import error caused by merge

pkg/kubecost/window.go

@@ -8,8 +8,6 @@ import (
 	"strconv"
 	"time"
 
-	"github.com/kubecost/cost-model/pkg/util/timeutil"
-
 	"github.com/kubecost/cost-model/pkg/env"
 	"github.com/kubecost/cost-model/pkg/thanos"
 	"github.com/kubecost/cost-model/pkg/util/timeutil"