py-uv-build: add missing dependency

[thomas-bouvier]

This fixes the following error:

/mnt/storage/opt/spack/linux-x86_64/py-uv-build-0.8.2-dchpcvtibzryhw76o4eoxffkc275ukhw/bin/uv-build: error while loading shared libraries: libbz2.so.1.0: cannot open shared object file: No such file or direct
ory  
    error: subprocess-exited-with-error                                                                   
      
    × Preparing metadata (pyproject.toml) did not run successfully.     
    │ exit code: 127                                                                                      
    ╰─> No available output.