Remove failing test assertion that is no longer needed with astropy 5…

….3.1.

(cherry picked from commit 9f2dbaf)

astrodata/tests/test_utils.py

@@ -8,10 +8,6 @@
 
 
 def test_header_for_table():
-    tbl = Table([[[1], [2, 3], [3, 4, 5]]], dtype=['object'])
-    with pytest.raises(ValueError, match=r"Illegal format `object`"):
-        header_for_table(tbl)
-
     tbl = Table([np.arange(2 * 3 * 4).reshape(3, 2, 4),
                  [1.0, 2.0, 3.0],
                  ['aa', 'bb', 'cc'],
@@ -82,4 +78,4 @@ def test_section_relations():
 
     ss = s2.shift(100, 200)
     assert ss.is_same_size(s2)
-    assert ss == Section(100, 1124, 200, 456)
+    assert ss == Section(100, 1124, 200, 456)