Bump version to 6.13.0


Change-Id: I83e2d31c05704625bd01306554471da93fc63486
Reviewed-by: Qt Submodule Update Bot <qt_submodule_update_bot@qt-project.org>
commit1b9fd975ba3a6a9cf1f81145fb5d555bf1a7ba65
parentca533d10884831de4bfd496bf16cf8078c1d211e
authorJani Heikkinen <jani.heikkinen@qt.io>
committerJani Heikkinen <jani.heikkinen@qt.io>
commit timeFri, 5 Jun 2026 04:29:39 +0000