fix(haskell): downgrade haskell version to `8.6.5` from `8.8.1`
fix(haskell): downgrade haskell version to `8.6.5` from `8.8.1`

Current `stack` does not support GHC 8.8.x.

Signed-off-by: Yghor Kerscher <95d23bc6109ee665a51a66121173c9c2a1098109@acm.org>

kerscher/dotfiles