Bump tokenizers dep

[jackzhxng]

Update tokenizers submodule to include all of the recent pcre2 regex changes

Depends on:

• Recursive checkout in CI #10472
• Fix pcre2 target pytorch-labs/tokenizers#60

[pytorch-bot]

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❌ 1 New Failure, 2 Pending, 1 Unrelated Failure

As of commit 704bfbd with merge base 2837867 ():

NEW FAILURE - The following job has failed:

• apple-perf / benchmark-on-device (llama, xnnpack_q8, apple_iphone_15, arn:aws:devicefarm:us-west-2:30853538511... / mobile-job (ios) (gh)
  Process completed with exit code 22.

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

• apple-perf / benchmark-on-device (llama, coreml_fp16, apple_iphone_15, arn:aws:devicefarm:us-west-2:3085353851... / mobile-job (ios) (gh) (detected as infra flaky with no log or failing log classifier)

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