Update split SDK to 6.0.2 to fix sync bug (#17060)

* Update split SDK to 6.0.2 to fix sync bug

* Vendor and tidy

vendor/github.com/splitio/go-split-commons/v3/tasks/interface.go

@@ -0,0 +1,53 @@
+package tasks
+
+import (
+	"sync"
+
+	"github.com/splitio/go-toolkit/v4/logging"
+)
+
+// Task interface
+type Task interface {
+	Start()
+	Stop(blocking bool) error
+	IsRunning() bool
+}
+
+// MultipleTask struct
+type MultipleTask struct {
+	tasks  []Task
+	logger logging.LoggerInterface
+}
+
+// IsRunning method
+func (m MultipleTask) IsRunning() bool {
+	for _, t := range m.tasks {
+		if t.IsRunning() {
+			return true
+		}
+	}
+	return false
+}
+
+// Start method
+func (m MultipleTask) Start() {
+	for _, t := range m.tasks {
+		t.Start()
+	}
+}
+
+// Stop method
+func (m MultipleTask) Stop(blocking bool) error {
+	wg := sync.WaitGroup{}
+	wg.Add(len(m.tasks))
+	for _, t := range m.tasks {
+		go func(t Task) {
+			t.Stop(blocking)
+			wg.Done()
+		}(t)
+	}
+	if blocking {
+		wg.Wait()
+	}
+	return nil
+}