Bump tokenizers to b007644

[GregoryComer]

Summary

Update tokenizers to pick up meta-pytorch/tokenizers@b007644, which fixes an issue when referencing tokenizers via CMake find_package on Windows.

Test plan

CI

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/14638

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❌ 1 New Failure, 240 Pending

As of commit 36e26e7 with merge base 668e730 ():

NEW FAILURE - The following job has failed:

• pull / test-llama-lora-linux / linux-job (gh)
  RuntimeError: Command docker exec -t a603e425d933de305500fb44ef130c6621bb8dac614cbb3b351d6af8d53e348a /exec failed with exit code 1

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