Update test_autoarray/inversion/regularizations/test_matern_adaptive_brightness_kernel.py

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: Jammy2211

test_autoarray/inversion/regularizations/test_matern_adaptive_brightness_kernel.py

@@ -12,22 +12,8 @@ def test__regularization_matrix():
         coefficient=1.0, scale=2.0, nu=2.0, rho=1.0
     )
 
-    neighbors = np.array(
-        [
-            [1, 4, -1, -1],
-            [2, 4, 0, -1],
-            [3, 4, 5, 1],
-            [5, 2, -1, -1],
-            [5, 0, 1, 2],
-            [2, 3, 4, -1],
-        ]
-    )
-
-    neighbors_sizes = np.array([2, 3, 4, 2, 4, 3])
     pixel_signals = np.array([1.0, 2.0, 3.0, 4.0, 5.0, 6.0])
 
-    mesh_grid = aa.m.MockMeshGrid(neighbors=neighbors, neighbors_sizes=neighbors_sizes)
-
     source_plane_mesh_grid = aa.Grid2D.no_mask(
         values=[[0.1, 0.1], [1.1, 0.6], [2.1, 0.1], [0.4, 1.1], [1.1, 7.1], [2.1, 1.1]],
         shape_native=(3, 2),