Render labels using Text.QtRendering on OSX

Fonts were looking a bit to thick on when using `Text.NativeRendering`, so using `Text.QtRendering` instead. After this the font weight looks identical to figma (as far as I can see).

In this commit I also changed all `Label`'s to `UM.Label`'s and removed default properties where I could.

CURA-9154

plugins/UltimakerMachineActions/UMOUpgradeSelectionMachineAction.qml

@@ -20,7 +20,7 @@ Cura.MachineAction
         anchors.topMargin: UM.Theme.getSize("default_margin").width * 5
         anchors.leftMargin: UM.Theme.getSize("default_margin").width * 4
 
-        Label
+        UM.Label
         {
             id: pageDescription
             anchors.top: parent.top
@@ -29,8 +29,6 @@ Cura.MachineAction
             wrapMode: Text.WordWrap
             text: catalog.i18nc("@label","Please select any upgrades made to this Ultimaker Original")
             font: UM.Theme.getFont("medium")
-            color: UM.Theme.getColor("text")
-            renderType: Text.NativeRendering
         }
 
         UM.CheckBox