Bump version to 6.13.0


Change-Id: I9e8939851636482bbeab8229f41428be08249941
Reviewed-by: Qt Submodule Update Bot <qt_submodule_update_bot@qt-project.org>
commitd376e3c29e9fcdf89bc4161d017f07f5ec1d22dd
parent7f808d8e8e8740278a2486efbab440c27161f251
authorJani Heikkinen <jani.heikkinen@qt.io>
committerJani Heikkinen <jani.heikkinen@qt.io>
commit timeThu, 4 Jun 2026 22:37:19 +0000