Bump ghc-prim to 0.7.0
Commit 68b71c4a renamed GHC.Tuple.Unit to GHC.Tuple.Solo, which is a breaking API change. Accordingly, we should bump the major version number of GHC.Tuple's library, ghc-prim, to 0.7.0. This will require a pull request to text to accomplish.
Edited by Ryan Scott