Enable Fourmolu plugin on GHC 9.6

Author: georgefst

haskell-language-server.cabal

@@ -334,7 +334,7 @@ common floskell
     cpp-options: -Dhls_floskell
 
 common fourmolu
-  if flag(fourmolu) && impl(ghc < 9.5)
+  if flag(fourmolu)
     build-depends: hls-fourmolu-plugin ^>= 1.1
     cpp-options: -Dhls_fourmolu
 

plugins/hls-fourmolu-plugin/hls-fourmolu-plugin.cabal

@@ -23,8 +23,7 @@ source-repository head
   location: git://github.com/haskell/haskell-language-server.git
 
 library
-  if impl(ghc >= 9.5)
-    buildable: False
+  buildable: True
   exposed-modules:
       Ide.Plugin.Fourmolu
     , Ide.Plugin.Fourmolu.Shim
@@ -49,8 +48,7 @@ library
   default-language: Haskell2010
 
 test-suite tests
-  if impl(ghc >= 9.5)
-    buildable: False
+  buildable: True
   type:             exitcode-stdio-1.0
   default-language: Haskell2010
   hs-source-dirs:   test