dvc: bump to 2.0.0a0 (#5250)
dvc: bump to 2.0.0a0 (#5250)

Looking at the log is confusing, as the version is stuck in `1.11.0` whereas the recent one is `1.11.10`.

As the updater is also dependent on that version, it prints an ugly update message while running too.
https://github.com/iterative/dvc/issues/5023#issuecomment-758450519
efiop/dvc,dmpetrov/dataversioncontrol,efiop/dvc,dmpetrov/dataversioncontrol