IntelPython / dpnp / 29998170042

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Relax float16 tolerance in cupy trigonometric binary tests (#3005)

The GitHub workflow might fail on
`third_party/cupy/math_tests/test_trigonometric.py::TestTrigonometric::test_arctan2`:
```
Mismatched elements: 1 / 6 (16.7%)
 [0, 1]: 0.38037109375 (ACTUAL, dpnp), 0.380615234375 (DESIRED, numpy)
Max absolute difference: 0.0002441
```

This is the `float16` (`"e"` dtype) parametrization of
`check_binary("arctan2")`, which asserts with a flat `atol=1e-5`. That
tolerance is tighter than the resolution of float16 — one ULP near 0.38
is ~2.4e-4.

This PR proposes to use a float16-aware tolerance. for `check_binary`.
This mirrors the pattern already used by `check_unary_unit` in the same
file, and leaves the default `1e-5` tolerance unchanged for all
higher-precision dtypes.

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