H266RawSliceHeader.num_entry_points is an uint32_t.
Fixes -Wformat warnings:
https://fate.ffmpeg.org/log.cgi?slot=aarch64-osx-clang-1200.0.32.29&time=20240604151047&log=compileSigned-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>