The 1.3 branch does not exist anymore, let's use 5.6

Change-Id: I442ad45c73a0e08c853385c999dddf818447bb82
Reviewed-by: Simon Hausmann <simon.hausmann@theqtcompany.com>
Reviewed-by: Jędrzej Nowacki <jedrzej.nowacki@theqtcompany.com>
Reviewed-by: Jani Heikkinen <jani.heikkinen@theqtcompany.com>