Bump version to 6.13.0


Change-Id: I86f5c3c9ca8945b88ede381daecd0057fec8841d
Reviewed-by: Qt Submodule Update Bot <qt_submodule_update_bot@qt-project.org>
commit9598eba0f6f92502d43273cdd0a547b8c19bae78
parent1db92de276ae99bf130dc12225233a188f753d59
authorJani Heikkinen <jani.heikkinen@qt.io>
committerJani Heikkinen <jani.heikkinen@qt.io>
commit timeThu, 4 Jun 2026 06:04:41 +0000