Auto merge of #107574 - compiler-errors:back-to-old-mac-builders-pls, r=pietroalbini

Revert "switch to the macos-12-xl builder"

This reverts commit fcbae989ae790d5b9a0a23ceba242d0b0d4e6c5b.

This should fix the bors failures in https://rust-lang.zulipchat.com/#narrow/stream/242791-t-infra/topic/Every.20rust-lang.2Frust.20PR.20is.20failing.20bors

Author: bors