Downgrade the macOS version used for Docker tests to macos-13 to fix recent Docker build failures

Author: Jared Deiner

.github/workflows/ci.yml

@@ -15,7 +15,9 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ ubuntu-latest, macos-latest ]
+        os:
+         - ubuntu-latest
+         - macos-13 # Later versions of ARM-based macOS runners fail because the hypervisor framework required for Docker is not supported
         python: [ "3.8", "3.9", "3.10", "3.11"]
         node: [ 20 ]
     env: