bump default install version to 1.26 (#3683)

Author: neoaggelos

installer/windows/microk8s.nsi

@@ -162,7 +162,7 @@ Function "ConfigureVm"
         ${NSD_CreateLabel} 42% 50 50u 10u "Snap Track"
         Pop $VmConfigureDialogTrackLabel
 
-        ${NSD_CreateText} 42% 67.5 50u 10u "1.23/stable"
+        ${NSD_CreateText} 42% 67.5 50u 10u "1.26/stable"
         Pop $VmConfigureDialogTrack
 
         ${NSD_CreateLabel} 8% 102.5 100% 10u "These are the minimum recommended parameters for the VM running ${PRODUCT_NAME}"