[CI] Use x86 MacOS for Jupyter examples tests

GitHub's `macos-latest` runner is now ARM based. Until we build ARM
wheels for MacOS, we must downgrade the runner to an x86 machine.

Signed-off-by: David Feltell <david.feltell@foundry.com>

.github/workflows/examples.yml

@@ -16,7 +16,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: ["windows-latest", "ubuntu-latest", "macos-latest"]
+        os: ["windows-latest", "ubuntu-latest", "macos-13"]
         python: ["3.7", "3.9", "3.10"]
     steps:
       - uses: actions/checkout@v3