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

[swolchok]

This reverts commit 727851945b526be32fc38a430ce8e31fd910fef6.

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[bot]]

:link: Helpful Links

:test_tube: See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/7013

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• [DomainsOnly] Jobs fail with GLIBC version not found

:x: 1 New Failure

As of commit da3673c9c15c2b9317cc0ba8604f283845a3c725 with merge base 0070680ce04e274aaa4c2082e2fb26335f6f9f13 ():

NEW FAILURE - The following job has failed:

* [Check Labels / Check labels](https://hud.pytorch.org/pr/pytorch/executorch/7013#33347931422) ([gh](https://github.com/pytorch/executorch/actions/runs/11961520987/job/33347931422)) `RuntimeError: Error checking labels: PR does not have required labels`

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[github-actions[bot]]

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[swolchok]

wheel build still broken