Bump version to 6.13.0


Change-Id: I67260002fbfb4660ad413af6f61c057020ae5ea2
Reviewed-by: Qt Submodule Update Bot <qt_submodule_update_bot@qt-project.org>
commit624dd6fd54ea9a9cda5ac701042d576a560c1172
parent30ab22b2a54658c570599380a004045515dbe369
authorJani Heikkinen <jani.heikkinen@qt.io>
committerJani Heikkinen <jani.heikkinen@qt.io>
commit timeThu, 4 Jun 2026 21:59:59 +0000