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[GitHub] Fix slow sccache install on macOS by upgrading macOS version (…
…llvm#77165) The "Setup ccache" step on macOS-11 builds takes between 15 to 20 mins, whereas this step takes a less than 10 seconds on other runners. The bulk of this time is spent at the "Install sccache" step, where brew emits warnings like "Warning: You are using macOS 11." and "We (and Apple) do not provide support for this old version...". Bumping the version of macOS greatly decreases this cache setup time to about 20 seconds. Furthermore, it seems like it is speeding up general build times, too. It appears that actions/runner-images#5900 has been resolved or obsoleted, so I do not believe we need to lock macOS to 11 anymore.
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