Update the list of excepted dependencies for current ghc-8.4, based on the
release notes at
https://downloads.haskell.org/~ghc/8.4.3/docs/html/users_guide/8.4.3-notes.html
Particularly, this adds `text` to the list, which is a dependency of `parsec`
which was already on the list before, causing build failures with updated
versions of the `text` package.
* guix/import/hackage.scm (ghc-standard-libraries): Update list.
Signed-off-by: Ricardo Wurmus <rekado@elephly.net>