increment client cache format to v2

The client cache in sql-land was broken: it sent over the wrong sync token as the default.
This meant that the server thought that this was a much older client. As a result, any
0.9.3+ packages with '_' or '||' in their versions/dependencies were filtered out. There is no
easy way to undo that sort of filtering without deleting the db for a variety of reasons, and if
we are going to delete the db, we might as well increment the version so we don't have to worry about
consistency.