Arm backend: Relax Qwen3-VL BF16 text tolerance

[Sebastian-Larsson]

Raise the aarch64 TOSA BF16 tolerance for the Qwen3-VL text full-model test only.

cc @digantdesai @freddan80 @per @zingo @oscarandersson8218 @mansnils @robell @rascani

[pytorch-bot]

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❌ 4 New Failures

As of commit 58f1404 with merge base fa49f8f ():

NEW FAILURES - The following jobs have failed:

• pull / unittest / linux / linux-job (gh)
  RuntimeError: Command docker exec -t d44fa24323de9e45fc2a8aa3c27769535706425e7bb2c522ada2201370e14ee9 /exec failed with exit code 1
• pull / unittest-editable / linux / linux-job (gh)
  RuntimeError: Command docker exec -t 116f1be46767648dbe9557816359e036d753afe711777ed7e4db5b1861fe27ba /exec failed with exit code 1
• pull / unittest-nxp-neutron / linux-job (gh)
  RuntimeError: Command docker exec -t 8ec5d8eafdc1ee52a1d8cfb12c4d6843528be82f65edccb4aed94a2244585cf3 /exec failed with exit code 1
• trunk / unittest-release / linux / linux-job (gh)
  RuntimeError: Command docker exec -t ea7a1a0b9a1f7908063349545c4472a07dc6eac809c51266de68da644fdd4178 /exec failed with exit code 1

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