The Debian container moves from bookworm to trixie. Two packages were
renamed in trixie and their old names are now transitional dummies:
pkg-config is provided by pkgconf, and libgl1-mesa-dev split into
libgl-dev + libglvnd-dev. The CI and CD Debian dependency lists stay
byte-for-byte identical.
trixie ships libva 2.22, which has the vaMapBuffer2 FFmpeg 8 expects,
so only openKylin still needs the bundled vcpkg libva copies.