Bump minimum cmake/qt versions

CMakeLists.txt

-cmake_minimum_required(VERSION 3.0)
+cmake_minimum_required(VERSION 3.16)
 
 # KDE Application Version, managed by release script
 set (RELEASE_SERVICE_VERSION_MAJOR "22")
@@ -7,7 +7,7 @@ set (RELEASE_SERVICE_VERSION_MICRO "70")
 set (RELEASE_SERVICE_VERSION "${RELEASE_SERVICE_VERSION_MAJOR}.${RELEASE_SERVICE_VERSION_MINOR}.${RELEASE_SERVICE_VERSION_MICRO}")
 project(kio-gdrive VERSION ${RELEASE_SERVICE_VERSION})
 
-set(QT_MIN_VERSION 5.2.0)
+set(QT_MIN_VERSION 5.15.0)
 set(KF5_MIN_VERSION 5.71.0)
 set(KGAPI_MIN_VERSION 5.11.41)
 set(KACCOUNTS_MIN_VERSION 20.03.80)