Fix test dependencies for 0.11

[cdepillabout]

purescript-spec needs to be updated for 0.11 (purescript-spec/purescript-spec#45). When it is updated, we can update the test dependencies for purescript-unicode as mentioned in #8.

[cdepillabout]

It should also roll back #10.

Looping in @paf31 just in case.

[paf31]

👍 Thanks