Bump version to 6.13.0


Change-Id: I2b43aa62fd7543f2b411772076fb0747dbed0ad8
Reviewed-by: Qt Submodule Update Bot <qt_submodule_update_bot@qt-project.org>
commit78942fce0bdb3eeefb58a6a1119fcd71847bdbd4
parent7921a2de39e31dcb43549fe727fdc7c07fb9e796
authorJani Heikkinen <jani.heikkinen@qt.io>
committerJani Heikkinen <jani.heikkinen@qt.io>
commit timeThu, 4 Jun 2026 06:07:15 +0000