[llvm] workflows/release-binaries: Stop using ccache (PR #124415)

[Carlo Cabrera via llvm-commits]

https://github.com/carlocab approved this pull request.

Seems fine to me, but note that GitHub Actions cache already has built-in protections against cache poisoning.

For example, caches from PR branches are quarantined from other branches so PRs generally cannot introduce malicious code into other PRs or onto the main branch until the PR is merged.

But we can merge this for now and revert when the cache has been audited properly.

https://github.com/llvm/llvm-project/pull/124415