Add ghc 9.6.6 (#2225)

lazy-inputs/default.nix

@@ -28,6 +28,7 @@ in {
       inherit ((callFlake { pkgs = final; src = ./ghc963; }).defaultNix) ghc963;
       inherit ((callFlake { pkgs = final; src = ./ghc964; }).defaultNix) ghc964;
       inherit ((callFlake { pkgs = final; src = ./ghc965; }).defaultNix) ghc965;
+      inherit ((callFlake { pkgs = final; src = ./ghc966; }).defaultNix) ghc966;
       inherit ((callFlake { pkgs = final; src = ./ghc981; }).defaultNix) ghc981;
       inherit ((callFlake { pkgs = final; src = ./ghc982; }).defaultNix) ghc982;
       inherit ((callFlake { pkgs = final; src = ./ghc9101; }).defaultNix) ghc9101;

lazy-inputs/ghc966/flake.nix

@@ -0,0 +1,12 @@
+{
+  description = "Lazy Input for Haskell.nix";
+
+  inputs = {
+    ghc966 = {
+      flake = false;
+      url = "git+https://github.com/stable-haskell/ghc?ref=ghc-9.6.6-iog&submodules=1";
+    };
+  };
+
+  outputs = inputs: inputs;
+}