Add support django50 and python3.12

[zetahernandez]

No description provided.

[akx]

Tests seem to be flaking on partition order issues:

>       assert partition_names == [par.name for par in table.partitions]
E       AssertionError: assert ['2019_jan', '2019_mar'] == ['2019_mar', '2019_jan']
E         At index 0 diff: '2019_jan' != '2019_mar'
E         Use -v to get the full diff

[SebCorbin]

We also have a regression on annotation_select_mask:

The undocumented Query.annotation_select_mask attribute is changed from a
set of strings to an ordered list of strings.