Fix kerchunk error in docs build (pydata#10545)

Author: dcherian

doc/combined.json

@@ -10,9 +10,6 @@
     "x/0": ["saved_on_disk.h5", 8352, 32],
     "y/.zarray": "{\"chunks\":[5],\"compressor\":null,\"dtype\":\"<i8\",\"fill_value\":null,\"filters\":null,\"order\":\"C\",\"shape\":[5],\"zarr_format\":2}",
     "y/.zattrs": "{\"_ARRAY_DIMENSIONS\":[\"y\"],\"calendar\":\"proleptic_gregorian\",\"units\":\"days since 2000-01-01 00:00:00\"}",
-    "y/0": ["saved_on_disk.h5", 8384, 40],
-    "z/.zarray": "{\"chunks\":[4],\"compressor\":null,\"dtype\":\"|O\",\"fill_value\":null,\"filters\":[{\"allow_nan\":true,\"check_circular\":true,\"encoding\":\"utf-8\",\"ensure_ascii\":true,\"id\":\"json2\",\"indent\":null,\"separators\":[\",\",\":\"],\"skipkeys\":false,\"sort_keys\":true,\"strict\":true}],\"order\":\"C\",\"shape\":[4],\"zarr_format\":2}",
-    "z/0": "[\"a\",\"b\",\"c\",\"d\",\"|O\",[4]]",
-    "z/.zattrs": "{\"_ARRAY_DIMENSIONS\":[\"x\"]}"
+    "y/0": ["saved_on_disk.h5", 8384, 40]
   }
 }