Bump version to 6.13.0


Change-Id: I30b268760d664629be358168aa22841875066e98
Reviewed-by: Qt Submodule Update Bot <qt_submodule_update_bot@qt-project.org>
commitf51a99bd223a48b332295ea0e022b0023ebd3b59
parent981b5fb64f7b5560dc309585496893eb764d324d
authorJani Heikkinen <jani.heikkinen@qt.io>
committerJani Heikkinen <jani.heikkinen@qt.io>
commit timeThu, 4 Jun 2026 19:26:11 +0000