Downgrade macos image

Author: fendor

.github/workflows/test.yml

@@ -11,7 +11,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [macos-latest, ubuntu-latest, windows-latest]
+        os: [macos-12, ubuntu-latest, windows-latest]
         ghc: [8.10.7, 9.4.8, 9.6.4, 9.8.2]
     runs-on: ${{ matrix.os }}
     steps: