Revert "update sccache to latest version (#6837)"

[swolchok]

This reverts commit 7278519.

Nightly macos wheel builds are failing to link; seeing if this fixes
it after inspecting commits between last good build
(https://github.com/pytorch/executorch/actions/runs/11891594679) and
first bad build
(https://github.com/pytorch/executorch/actions/runs/11912200383)

[pytorch-bot]

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• [DomainsOnly] Jobs fail with GLIBC version not found

❌ 1 New Failure

As of commit da3673c with merge base 0070680 ():

NEW FAILURE - The following job has failed:

• Check Labels / Check labels (gh)
  RuntimeError: Error checking labels: PR does not have required labels

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[swolchok]

wheel build still broken