* Remove ghc-api source snapshot

We can replace the source snapshot with Cabal conditions.
This will unblock Hackage uploads until
https://github.com/haskell/haskell-language-server/pull/2128 lands

* fix 9.0.1 build

* add allow-newer for ghc-api-compat

* fix version bounds for 9.0.1

* fix hls-eval-plugin

* stack fixes

* added new versions of ghc-api-compat

* remove source snapshot from ghc901 cabal project