Deletes the given dependencies' files, including build artifacts and fetched sources.

Since this is a destructive action, cleaning of dependencies only occurs when passing arguments/options:

• dep1 dep2 - the names of dependencies to be deleted separated by a space
• --unlock - also unlocks the deleted dependencies
• --build - deletes only compiled files (keeps source files)
• --all - deletes all dependencies
• --unused - deletes only unused dependencies (i.e. dependencies no longer mentioned in mix.exs)

By default this task works across all environments, unless --only is given which will clean all dependencies leaving only the ones for chosen environment.