remove deprecated numpy.typing.mypy_plugin in mypy.ini

[morrison-turnansky]

Fixes #156489
removed deprecated numpy plugin in mypy.ini
@ezyang

[pytorch-bot]

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✅ You can merge normally! (2 Unrelated Failures)

As of commit d8ed1a0 with merge base f5e1b24 ():

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• pull / before-test / target-determination (gh) (detected as infra flaky with no log or failing log classifier)

UNSTABLE - The following job is marked as unstable, possibly due to flakiness on trunk:

• pull / cuda12.8-py3.10-gcc9-sm75 / test (pr_time_benchmarks, 1, 1, linux.g4dn.metal.nvidia.gpu, unstable) (gh) (#153987)
  MISSING REGRESSION TEST

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[ezyang]

I think this will probably cause some typing failures now though

[ezyang]

@pytorchbot merge

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