Stop running tests on non-existing macos-12 (#318)

Author: giordano

.github/workflows/example-builds-nightly-defaultarch.yml

@@ -22,11 +22,9 @@ jobs:
         os:
           - ubuntu-latest
           - windows-latest
-          # - macos-11 # Intel
-          - macos-12 # Intel
           - macos-13 # Intel
           - macos-14 # Apple Silicon
-          - macos-latest # Currently Intel, but will probably point to Apple Silicon in the future
+          - macos-latest # Apple Silicon
 
     steps:
       - uses: actions/checkout@v4