Add Haskell Language Server 2.9 (#2222)

Author: hamishmack

build.nix

@@ -62,10 +62,10 @@ in rec {
         inherit evalPackages;
         src = pkgs.haskell-nix.sources."hls-2.2";
       };
-    } // pkgs.lib.optionalAttrs (ghcFromTo "9.0" "9.9") {
-      "hls-28" = tool compiler-nix-name "haskell-language-server" {
+    } // pkgs.lib.optionalAttrs (ghcFromTo "9.0" "9.11") {
+      "hls-29" = tool compiler-nix-name "haskell-language-server" {
         inherit evalPackages;
-        src = pkgs.haskell-nix.sources."hls-2.8";
+        src = pkgs.haskell-nix.sources."hls-2.9";
       };
     })
   );

flake.lock

@@ -24,6 +24,7 @@
     "hls-2.6" = { url = "github:haskell/haskell-language-server/2.6.0.0"; flake = false; };
     "hls-2.7" = { url = "github:haskell/haskell-language-server/2.7.0.0"; flake = false; };
     "hls-2.8" = { url = "github:haskell/haskell-language-server/2.8.0.0"; flake = false; };
+    "hls-2.9" = { url = "github:haskell/haskell-language-server/2.9.0.0"; flake = false; };
     hydra.url = "hydra";
     hackage = {
       url = "github:input-output-hk/hackage.nix";