Update test_ring_attention.py to fix CI

[kimishpatel]

The said tests are passing internally but fail in OSS CI likely due to tolerance being 1e-7. But these failures are flaky so they dont always fail. Skipping to fix CI

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[mergennachin]

@kimishpatel

This is not flaky per se. It is failing consistently in OSS https://hud.pytorch.org/hud/pytorch/executorch/main/1?per_page=50&name_filter=unittest

After @leafs1 's PR in #11286

[mergennachin]

I'd rather revert this PR #12090 instead

[kimishpatel]

It is strange then we landed the PR if it broke the test.

However, I think it is completely accidental. Let me see if I can repro this. Last time I tried, which likely was before that PR, I could not repro it

[kimishpatel]

I'd rather revert this PR #12090 instead

Ok thast fine with me too, but a) I dont think they are related and b) I did see this being flaky but lets wait for flakiness to show up again before disabling it.

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