ci: pin macos runner version

see: https://github.blog/changelog/2024-05-20-actions-upcoming-changes-to-github-hosted-macos-runners/
Signed-off-by: Rifa Achrinza <[email protected]>

Author: achrinza

.github/workflows/ci.yaml

@@ -16,7 +16,7 @@ jobs:
       matrix:
         os:
           - ubuntu-latest
-          - macos-latest
+          - macos-13
           - windows-latest
         node-version:
           - 8