build: test macos-13 on GitHub actions

We are in the process of updating macOS to version 13 in the
Jenkins CI, but unfortunately this is taking longer than expected.
Add it to the GitHub actions test matrix so that we have some coverage.

Refs: nodejs/build#3686
PR-URL: #56307
Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>
Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: Chengzhong Wu <legendecas@gmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

.github/workflows/test-macos.yml

@@ -38,7 +38,11 @@ permissions:
 jobs:
   test-macOS:
     if: github.event.pull_request.draft == false
-    runs-on: macos-14
+    strategy:
+      fail-fast: false
+      matrix:
+        macos-version: [macos-13, macos-14]
+    runs-on: ${{ matrix.macos-version }}
     env:
       CC: sccache gcc
       CXX: sccache g++