TST: Add Intel Mac Runner

Author: scott-huberty

.github/workflows/test.yaml

@@ -13,7 +13,10 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-latest, macos-latest]
+        os:
+          - ubuntu-latest
+          - macos-latest  # Latest Apple Silicon macOS
+          - macos-13  # Latest Intel-based macOS
         python-version: ['3.10']
 
     steps: