* gnu/packages/kde-utils.scm (kronometer): Update to 2.3.0. [inputs]: Replace kauth, kconfig, kconfigwidgets, kcoreaddons, kcrash, ki18n, kwidgetsaddons, and kxmlgui with kauth-5, kconfig-5, kconfigwidgets-5, kcoreaddons-5, kcrash-5, ki18n-5, kwidgetsaddons-5, and kxmlgui-5. [native-inputs]: Replace kdoctools with kdoctools-5. Change-Id: I730b366a65fbee3724470fa65ab555ecd0af2098