Bump version to 6.13.0


Change-Id: I289c8d37be7f47b0b7f9ec92fc84e52cd0ebdb4b
Reviewed-by: Qt Submodule Update Bot <qt_submodule_update_bot@qt-project.org>
commit5a6ba2ef4ee918d2439d3a22e4cc08220451fd81
parenta4ddde60e82a971b849856b8eef55f84a711a286
authorJani Heikkinen <jani.heikkinen@qt.io>
committerJani Heikkinen <jani.heikkinen@qt.io>
commit timeFri, 5 Jun 2026 02:03:30 +0000