fix build in GHC 9

Author: pepeiborra

ghcide/src/Development/IDE/Core/Compile.hs

@@ -106,7 +106,6 @@ import           Data.Map                          (Map)
 import           Data.Tuple.Extra                  (dupe)
 import           Data.Unique                       as Unique
 import           Development.IDE.Core.Tracing      (withTrace)
-import           GhcPlugins                        (FinderCache)
 import qualified Language.LSP.Server               as LSP
 import qualified Language.LSP.Types                as LSP
 import           Unsafe.Coerce

ghcide/src/Development/IDE/GHC/Compat/Units.hs

@@ -45,6 +45,7 @@ module Development.IDE.GHC.Compat.Units (
     ExternalPackageState(..),
     -- * Utils
     filterInplaceUnits,
+    FinderCache,
     ) where
 
 #if MIN_VERSION_ghc(9,0,0)
@@ -59,6 +60,7 @@ import           GHC.Driver.Types
 import           GHC.Data.FastString
 import qualified GHC.Driver.Session              as DynFlags
 import           GHC.Types.Unique.Set
+import           GHC.Unit.Finder                 (finderCache)
 import qualified GHC.Unit.Info                   as UnitInfo
 import           GHC.Unit.State                  (LookupResult, UnitInfo,
                                                   UnitState (unitInfoMap))