refactor(package/mcl/test): Change flake.flakeModules to flake.modules.flake

Author: galin-s

packages/mcl/src/src/mcl/utils/test/nix/shard-matrix-ok/flake.nix

@@ -13,7 +13,7 @@
     }:
     flake-parts.lib.mkFlake { inherit inputs; } {
       systems = [ "x86_64-linux" ];
-      imports = [ nixos-modules.flakeModules.shardSplit ];
+      imports = [ nixos-modules.modules.flake.shardSplit ];
 
       mcl.matrix.shard = {
         size = 10;