GIT_SILENT: future kf5 will depend against qt5.15.2, we will depend against it too.

CMakeLists.txt

@@ -28,7 +28,7 @@ option(DISABLE_KWATCHGNUPG "Don't build the kwatchgnupg tool [default=OFF]" OFF)
 set(KF5_MIN_VERSION "5.85.0")
 set(KMIME_VERSION "5.18.40")
 set(LIBKLEO_VERSION "5.18.40")
-set(QT_REQUIRED_VERSION "5.15.0")
+set(QT_REQUIRED_VERSION "5.15.2")
 set(GPGME_REQUIRED_VERSION "1.13.1")
 set(BOOST_REQUIRED_VERSION "1.58")