Update executorch-ubuntu-26.04-gcc15 docker image to ubuntu-26.04-gcc14

[luhenry]

Summary

There are too many build failures with gcc15. Highlighted in #19917

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/20304

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❌ 3 New Failures, 9 Cancelled Jobs, 4 Pending, 2 Unclassified Failures

As of commit 39ad753 with merge base e28ef13 ():

NEW FAILURES - The following jobs have failed:

• Cadence Build & Test / hifi-build / hifi4 (gh)
  Input required and not supplied: aws-region
• Cadence Build & Test / vision-build / vision (gh)
  Input required and not supplied: aws-region
• pull / test-qnn-testsuite-linux / test-backend-linux (qnn, models) / linux-job (gh)
  Failed to CreateArtifact: Received non-retryable error: Failed request: (403) Forbidden: job is completed

UNCLASSIFIED FAILURES - DrCI could not classify the following jobs because the workflow did not run on the merge base. The failures may be pre-existing on trunk or introduced by this PR:

• Build Aarch64 Linux Wheels / pytorch/executorch / build-wheel-py3_10-cpu-aarch64 (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
  /__w/executorch/executorch/pytorch/executorch/backends/apple/coreml/runtime/inmemoryfs/inmemory_filesystem.cpp:722:48: error: ‘inmemoryfs::InMemoryFileSystem::InMemoryNode::Kind’ has not been declared
• Build Aarch64 Linux Wheels / pytorch/executorch / upload / upload-wheel-py3_10-cpu-aarch64 (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
  Unable to download artifact(s): Artifact not found for name: pytorch_executorch__3.10_cpu_aarch64

CANCELLED JOBS - The following jobs were cancelled. Please retry:

• pull / test-arm-backend-no-driver (test_pytest_ops_no_target) / linux-job (gh)
  ##[error]The operation was canceled.
• pull / test-lora-linux / linux-job (gh)
  ##[error]The operation was canceled.
• pull / test-models-linux (mv2, xnnpack-quantization-delegation, linux.2xlarge) / linux-job (gh)
  ##[error]The operation was canceled.
• pull / test-qnn-direct-build-linux / linux-job (gh)
  ##[error]The operation was canceled.
• pull / test-qnn-passes-linux / linux-job (gh)
• pull / test-qnn-python-imports-linux / linux-job (gh)
  ##[error]The operation was canceled.
• pull / unittest / linux / linux-job (gh)
  ##[error]The operation was canceled.
• pull / unittest-editable / linux / linux-job (gh)
  ##[error]The operation was canceled.
• pull / unittest-nxp-neutron / linux-job (gh)
  ##[error]The operation was canceled.

This comment was automatically generated by Dr. CI and updates every 15 minutes.

[luhenry]

cc @rascani

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