Fix cleaning of sbt-bridge cache
Fix cleaning of sbt-bridge cache

Using `NOT_PUBLISHED` was a bad idea: this actually is published
locally, and this doesn't work with `dotty-sbt-bridge/cleanSbtBridge`.
Use the real version number instead.

som-snytt/dotty,sjrd/dotty,som-snytt/dotty,som-snytt/dotty,sjrd/dotty,lampepfl/dotty,dotty-staging/dotty,lampepfl/dotty,lampepfl/dotty,dotty-staging/dotty,lampepfl/dotty,dotty-staging/dotty,sjrd/dotty,dotty-staging/dotty,sjrd/dotty,dotty-staging/dotty,sjrd/dotty,som-snytt/dotty,lampepfl/dotty,som-snytt/dotty