v6.9.0

Bumped!

Diff: v6.8.1...v6.9.0

Changes:

• Implement ConfirmDialog for ToolbarButton [de69e21] (@elring)
• Fix Quality checks (mainly useless annotations) [a661bf8] (@elring)
• Support for sum aggregation function in Nextras DataSource [e4ae5d2] (@milsorm)
• phpstan issue resolved [17931e4] (@milsorm)
• Unused use removed [e4f247a] (@milsorm)
• QA issues [527ab95] (@milsorm)
• IDataSource::getData returns iterable instead array [1dd1de2] (@AliAmjid)
• fix: Export::invoke expects array [8e9d686] (@AliAmjid)
• Convert primaryKey value to int if it is numeric [eeaeae6] (@juniwalk)