mps compile: Bump PT pin to April 18th

[manuelcandales]

PR #150661 fixed issue #150629. We need to bump the torch pin by one day, since #150661 was included in the April 18th nightly.

[pytorch-bot]

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• [Infra] Jobs got intermittently cancelled/fail midway checkout

✅ You can merge normally! (2 Unrelated Failures)

As of commit a0593c3 with merge base f7c4f14 ():

FLAKY - The following jobs failed but were likely due to flakiness present on trunk:

• Run parallel prefill / test-sdpa-backends-export / linux-job (gh) (matched linux rule in flaky-rules.json)
  The runner has received a shutdown signal. This can happen when the runner service is stopped, or a manually started runner is canceled.
• Run the aoti runner with CUDA using stories / test-runner-aot-cuda / linux-job (gh) (matched linux rule in flaky-rules.json)
  The runner has received a shutdown signal. This can happen when the runner service is stopped, or a manually started runner is canceled.

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