This is one of the packages which aren't needed by the toolchain
build itself, but is provided as a convenience to useres of the image.
Many projects that build standalone x86 assembly can use either
nasm or yasm, but lately most projects prefer nasm (which has
support for newer x86 simd extensions).
In Ubuntu 24.04, this package is no longer available.
However, this package probably never actually was needed anyway,
and was probably only provided as a convenience for users of the
docker image.
This raises the versions of bundled software, providing e.g.
autoconf 2.71, which is needed for Python 3.12.
As the releases are built (without a surrounding extra container)
on GitHub Actions these days, we don't need to hold the docker
images back to an old version for the sake of compatibility;
instead, updating to a newer version provides more modern tools
for users of the docker image.
Martin Storsjö