Publish macos with Python 3.8 on macos-12, not latest #1504

All 438 tests pass in 43m 1s

147 files ±0 147 suites ±0 43m 1s ⏱️ -54s
438 tests ±0 438 ✅ ±0 0 💤 ±0 0 ❌ ±0
64 386 runs ±0 62 874 ✅ ±0 1 512 💤 ±0 0 ❌ ±0

Results for commit 616215d. ± Comparison against earlier commit db26060.