Qt 6.4.0 Beta3: Generate diff to previous beta release

in qt5.git root (& expected that tqtc-qtsdk.git is cloned side by side qt5.git)

• git checkout <beta2 SHA1>
• git submodule update --init
• ../tqtc-qtsdk/packaging-tools/release_tools/check_changes.sh ../tqtc-qtsdk/packaging-tools/release_tools/qt6_4_submodule_and_additional_libraries_list.txt v6.4.0-beta1 HEAD 1 > delta_qt6.4.0-beta1_qt6.4.0-beta2.txt

( remove manually 'Update Dependencies' - changes from delta_qt6.4.0-beta1_qt6.4.0-beta2.txt)

This diff is then inserted to announce emails