[NumPy] Fix uses of the np.stack() family of functions under NumPy 1.25.

NumPy 1.25 release notes: https://github.com/numpy/numpy/releases/tag/v1.25.0

Per the release notes, in NumPy 1.25:

A sequence must now be passed into the stacking family of functions (stack, vstack, hstack, dstack and column_stack). (gh-23019)

This change fixes test failures where a non-sequence was passed to a stack function. The most common fix is to convert the input to a list explicitly before passing it to any stacking functions.

PiperOrigin-RevId: 542831919
Change-Id: I69cc25da897098fa11b6299145ab06c0eb37ad96

Author: hawkinsp

tutorial.ipynb

@@ -471,7 +471,7 @@
         "box_mat = physics.named.data.geom_xmat['red_box'].reshape(3, 3)\n",
         "box_size = physics.named.model.geom_size['red_box']\n",
         "offsets = np.array([-1, 1]) * box_size[:, None]\n",
-        "xyz_local = np.stack(itertools.product(*offsets)).T\n",
+        "xyz_local = np.stack(list(itertools.product(*offsets))).T\n",
         "xyz_global = box_pos[:, None] + box_mat @ xyz_local\n",
         "\n",
         "# Camera matrices multiply homogenous [x, y, z, 1] vectors.\n",