warnings: fix missing `override` warnings

Common/DataModel/vtkHyperTreeGridGeometricLocator.h

@@ -116,7 +116,7 @@ public:
 
 protected:
   vtkHyperTreeGridGeometricLocator() = default;
-  virtual ~vtkHyperTreeGridGeometricLocator() = default;
+  ~vtkHyperTreeGridGeometricLocator() override = default;
 
   /**
    * The recursive part of the point search

Common/DataModel/vtkHyperTreeGridLocator.h

@@ -121,7 +121,7 @@ public:
 protected:
   // Constructor/Destructor defaults
   vtkHyperTreeGridLocator() = default;
-  virtual ~vtkHyperTreeGridLocator() = default;
+  ~vtkHyperTreeGridLocator() override = default;
 
   /**
    * Internal reference to the HyperTreeGrid one wants to search over

Filters/Parallel/vtkHyperTreeGridPProbeFilter.h

@@ -118,7 +118,7 @@ protected:
    * Construction methods
    */
   vtkHyperTreeGridPProbeFilter();
-  virtual ~vtkHyperTreeGridPProbeFilter();
+  ~vtkHyperTreeGridPProbeFilter() override;
   ///@}
 
   ///@{

GUISupport/QtQuick/QQuickVTKRenderItem.h

@@ -158,7 +158,7 @@ class VTKGUISUPPORTQTQUICK_EXPORT QQuickVTKRenderItem
 
 public:
   QQuickVTKRenderItem(QQuickItem* parent = nullptr);
-  ~QQuickVTKRenderItem() = default;
+  ~QQuickVTKRenderItem() override = default;
 
   ///@{
   /**

GUISupport/QtQuick/QQuickVTKRenderWindow.h

@@ -156,7 +156,7 @@ public:
   /**
    * Destructor
    */
-  ~QQuickVTKRenderWindow();
+  ~QQuickVTKRenderWindow() override;
 
   /**
    * Set up the graphics surface format and api.