improve layout in UKAlertGroup

Author: mikhailChelbaev

Sources/ComponentsKit/Components/AvatarGroup/UIKit/UKAvatarGroup.swift

@@ -57,8 +57,15 @@ open class UKAvatarGroup: UIView, UKComponent {
   // MARK: - Layout
 
   private func layout() {
-    self.stackView.vertically()
+    self.stackView.centerVertically()
     self.stackView.centerHorizontally()
+
+    self.stackView.topAnchor.constraint(
+      greaterThanOrEqualTo: self.topAnchor
+    ).isActive = true
+    self.stackView.bottomAnchor.constraint(
+      lessThanOrEqualTo: self.bottomAnchor
+    ).isActive = true
     self.stackView.leadingAnchor.constraint(
       greaterThanOrEqualTo: self.leadingAnchor
     ).isActive = true