Add missing import

Author: m-Peter

bootstrap/bootstrap.go

@@ -16,6 +16,7 @@ import (
 	"github.com/onflow/flow-go/module/component"
 	"github.com/onflow/flow-go/module/irrecoverable"
 	flowMetrics "github.com/onflow/flow-go/module/metrics"
+	"github.com/onflow/flow-go/module/util"
 	gethTypes "github.com/onflow/go-ethereum/core/types"
 	"github.com/rs/zerolog"
 	"github.com/sethvargo/go-limiter/memorystore"