Update tokenizer pin

[mergennachin]

Here are the new commits:

meta-pytorch/tokenizers@3aada3f...7b26e65

[pytorch-bot]

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❌ 4 New Failures, 1 Cancelled Job, 1 Unrelated Failure

As of commit 460d953 with merge base c61b2ed ():

NEW FAILURES - The following jobs have failed:

• Copilot code review / Agent (gh)
  Process completed with exit code 1.
• pull / unittest-arm-backend-with-no-fvp (test_pytest_models) / linux-job (gh)
  RuntimeError: Command docker exec -t 9a37bd3c864fa7dfbbde2397e0bfbfc55a497cb6112b67c711b18525c2621021 /exec failed with exit code 1
• pull / unittest-buck / linux / linux-job (gh)
  RuntimeError: Command docker exec -t e2ef0b662afa9690a2cd89b3eee36ca206b9c2c7de6a6cbee3d0bcdc70eb2baa /exec failed with exit code 3
• pull / unittest-buck / macos / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 3

CANCELLED JOB - The following job was cancelled. Please retry:

• pull / test-samsung-models-linux / linux-job (gh)
  ##[error]The operation was canceled.

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

• pull / android / run-emulator (gh) (#16137)
  Timeout waiting for emulator to boot.

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[Copilot]

Pull request overview

This PR updates the git submodule reference for the tokenizers component to a newer commit.

Key Changes:

• Updates the tokenizers submodule commit hash from 3aada3fe28c945d14d5ec62254eb56ccdf10eb11 to 7b26e65a22f70dc0021612b12873fa0af818b51e

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