Fix version checks for property types

The wxWidgets commits that affect these types have not been released in
any 3.2 releases since 3.2.4, so it seems like they will only be in 3.3.

These are the relevant wxWidgets commits:
- wxWidgets/wxWidgets@159c3b1
- wxWidgets/wxWidgets@f1273ce

src/wx/widgets/PGPropertyValuesFlags.hx

@@ -1,6 +1,6 @@
 package wx.widgets;
 
-#if (wxWidgetsVersion > version("3.2.4"))
+#if (wxWidgetsVersion > version("3.3.0"))
 
 @:include("wx/propgrid/propgriddefs.h")
 extern enum abstract PGPropertyValuesFlags(PGPropertyValuesFlagsImpl) {

src/wx/widgets/styles/PropertyGridAttributes.hx

@@ -3,7 +3,7 @@ package wx.widgets.styles;
 // https://docs.wxwidgets.org/latest/property_8h.html#propgrid_property_attributes
 @:headerCode("#include <wx/propgrid/propgrid.h>")
 class PropertyGridAttributes {
-    #if (wxWidgetsVersion < version("3.2.3"))
+    #if (wxWidgetsVersion < version("3.3.0"))
     public static var ATTR_HINT:String                  =  untyped __cpp__("wxS(\"Hint\")");
     public static var ATTR_MAX:String                   =  untyped __cpp__("wxS(\"Max\")");
     public static var ATTR_MIN:String                   = untyped __cpp__("wxS(\"Min\")");