python312Packages.intake: remove code for macOS < 11

pkgs/development/python-modules/intake/default.nix

···
       # Require deprecated distutils
       "test_which"
       "test_load"
-    ]
-    ++
-      lib.optionals
-        (stdenv.hostPlatform.isDarwin && lib.versionOlder stdenv.hostPlatform.darwinMinVersion "10.13")
-        [
-          # Flaky with older low-res mtime on darwin < 10.13 (#143987)
-          "test_second_load_timestamp"
-        ];
+    ];
 
   pythonImportsCheck = [ "intake" ];