Blacklist jax 0.10.2

[alexfikl]

It seems to have gathered some errors for atan of the form

[8](https://github.com/inducer/loopy/actions/runs/28729714250/job/85193176285#step:3:1514)
FAILED test_arraycontext.py::test_array_context_np_workalike[<EagerJAXArrayContext>-arctan-1-float64] - assert False
 +  where False = <function allclose at 0x7f0c999e0970>(array([-0.62601646,  1.13303282,  0.        ,  0.        , -0.62601646,\n        1.13303282,  0.        ,  0.        , ...  0.3862027 ,\n        0.58829151,  0.        ,  0.        ,  0.3862027 ,  0.58829151,\n        0.        ,  0.        ]), array([-0.85794504,  0.6265242 ,  0.05130163, -1.2042635 , -0.62601646,\n        1.13303282,  0.38386949, -0.73835904, ...  0.09919862,\n        0.0561592 , -1.07848859, -0.92450816,  0.22791944, -0.6062315 ,\n        0.94313103, -0.78296983]))

These are like [value, value, 0, 0, ...], so it looks like some compilation bug. I can't seem to reproduce it locally, and all the failures here are on AMD EPYCs.

We could also implement atan in terms of atan2 for the jax backends, since that seems like it works?