* gnu/packages/qt.scm (qttools): Update to 6.6.2. [inputs]: Add zstd:lib. Change-Id: I8d5ea1b3135809e28e2d159e8050ee9642c66d27 Change-Id: I7b78392d11fc7d3e5e9319fd60f4fcf57b0e9c2d Signed-off-by: Maxim Cournoyer <maxim.cournoyer@gmail.com>