[llvm] [libcxx][Github] Bump Runners to Next Group (PR #168122)

[Louis Dionne via llvm-commits]

https://github.com/ldionne commented:

In this PR can you also update `libcxx/utils/ci/run-buildbot-container` to use `b80656b35af57619923b5bc5e453f42a19ed6c83`?

https://github.com/llvm/llvm-project/pull/168122