Use Julia binaries matching the runner's architecture in CI #397
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Currently, tests with Julia 1 and Julia pre on macOS-latest use x64 Julia binaries on an Apple silicon architecture. I saw weird test failures in some of the open PRs in exactly these cases, and I think it's just generally an unreliable mix.
Thus this PR changes CI such that 1.6 is tested on macOS-13 (Intel CPU) since no Apple silicon binaries are available for that Julia version, and for 1 and pre the Julia binaries for Apple silicon are used.