katesql: Port from Qt:SystemLocaleDate to QLocale
Qt::SystemLocaleDate (and Qt::SystemLocaleShortDate which is the replacement) is deprecated, which broke the build with the current deprecation level.
Qt::SystemLocaleDate (and Qt::SystemLocaleShortDate which is the replacement) is deprecated, which broke the build with the current deprecation level.
mentioned in commit 5e2b46a5