testing/miller: upgrade to 5.10.0
https://github.com/johnkerl/miller/releases/tag/v5.10.0
Removes the miller-doc package. Documentation has been moved to https://miller.readthedocs.io/en/latest/
https://github.com/johnkerl/miller/releases/tag/v5.10.0
Removes the miller-doc package. Documentation has been moved to https://miller.readthedocs.io/en/latest/