update version for new release

Qt changed the argument type again in 0ed34d1992

CMakeLists.txt

@@ -1,11 +1,11 @@
 cmake_minimum_required(VERSION 3.16)
 
-set(KF_VERSION "6.1.0") # handled by release scripts
-set(KF_DEP_VERSION "6.1.0") # handled by release scripts
+set(KF_VERSION "6.2.0") # handled by release scripts
+set(KF_DEP_VERSION "6.2.0") # handled by release scripts
 project(KImageFormats VERSION ${KF_VERSION})
 
 include(FeatureSummary)
-find_package(ECM 6.1.0  NO_MODULE)
+find_package(ECM 6.2.0  NO_MODULE)
 set_package_properties(ECM PROPERTIES TYPE REQUIRED DESCRIPTION "Extra CMake Modules." URL "https://commits.kde.org/extra-cmake-modules")
 feature_summary(WHAT REQUIRED_PACKAGES_NOT_FOUND FATAL_ON_MISSING_REQUIRED_PACKAGES)
 

src/imageformats/xcf.cpp

@@ -963,7 +963,7 @@ bool XCFImageFormat::loadImageProperties(QDataStream &xcf_io, XCFImage &xcf_imag
 #if QT_VERSION < QT_VERSION_CHECK(6, 7, 0)
                 quint32 size;
 #else
-                qsizetype size;
+                qint64 size;
 #endif
 
                 property.readBytes(tag, size);