Arm backend: Bump Arm baremetal compilers to gcc 14.3

[zingo]

cc @digantdesai @freddan80 @per @oscarandersson8218

[pytorch-bot]

🔗 Helpful Links

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❌ 2 New Failures, 5 Unrelated Failures

As of commit b63af4c with merge base dfc387b ():

NEW FAILURES - The following jobs have failed:

• Build documentation / build (buck2) / Build doc (gh)
  At least one of the pre-conditions you specified did not hold
• trunk / test-arm-cortex-m-size-test (bare_metal) / linux-job (gh)
  RuntimeError: Command docker exec -t 51f2b2c4d92ff6fcc298d2d2ea9baad929ecf49985e4120015c577a5b0f89ba5 /exec failed with exit code 1

BROKEN TRUNK - The following jobs failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• Apple / build-benchmark-app / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 1
• Apple / build-demo-ios / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 1
• Apple / build-frameworks-ios / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 1
• trunk / test-coreml-delegate / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 1
• trunk / test-huggingface-transformers-coreml (qwen3-1.7b|xnnpack|--quantize) / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 138

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[digantdesai]

Nit: if the URL names are predictable, extract 14.3 out as a variable might be better to avoid missing some toolchain in future updates.

[zingo]

I kind of agree and maybe we want to do this over time. As it's part of the filename it is now at lease nice to directly be able to cut&paste and search the web for it. Lets see if we change later.

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[zingo]

Will be replace with a better/newer version some day hopefully. This had gone old and needs a rebase.