Debian/qtbase-opensource-src: medium 6.2

An issue was discovered in gui/util/qktxhandler.cpp in Qt before 5.15.17, 6.x before 6.2.12, 6.3.x through 6.5.x before 6.5.5, and 6.6.x before 6.6.2. A buffer overflow and application crash can occur

Action: Upgrade qtbase-opensource-src to 5.15.8+dfsg-11+deb12u2 or later.