Use Ubuntu 25.10 as docker base

[impervius]

1. Use newly released and maintained Ubuntu 25.10 as base for docker (both builder and "prod")
2. Remove unneeded explicit python dependencies (Useless Python dependency lz4 ? #909)
3. Remove unneeded Ubuntu packages from the "prod" docker
4. Make pip.sh be coherent (same behavior for both pip and uv).

[impervius]

@devttys0 Also, please run cargo update, cargo clippy --fix and then cargo fmt, I didn't want to commit too much code changes.