Bump CI version to MacOS 13

See actions/runner-images#10721

Author: aswaterman

.github/workflows/continuous-integration.yml

@@ -38,7 +38,7 @@ jobs:
 
   test-macos:
     name: Test Spike build (MacOS)
-    runs-on: macos-12
+    runs-on: macos-13
     steps:
       - uses: actions/checkout@v2
         with: