feat: Mark IQueryBuilder::execute as removed

Signed-off-by: Carl Schwan <[email protected]>

Author: CarlSchwan

developer_manual/app_publishing_maintenance/app_upgrade_guide/upgrade_to_33.rst

@@ -87,3 +87,7 @@ Removed APIs
 - The ``\OCP\Search\PagedProvider``, ``\OCP\Search\Provider`` and ``\OCP\Search\Result`` classes were
   deprecated since Nextcloud 20 and were now removed. Instead use ``\OCP\Search\SearchResult`` and
   ``\OCP\Search\IProvider``, available since Nextcloud 20.
+- The ``\OCP\DB\IQueryBuilder::execute`` method was deprecated since Nextcloud 22 and was now removed.
+  Instead use the ``\OCP\DB\IQueryBuilder::executeQuery`` or ``\OCP\DB\IQueryBuilder::executeStatement``
+  method, available since Nextcloud 20.
+