OSV-2023-1103 Heap-buffer-overflow in OpenType::be_u32

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=63777 Crash type: Heap-buffer-overflow READ 1 Crash state: OpenType::beu32 OpenType::Cmap::subtable OpenType::Font::tryloadfromoffset...