Add macos-13 to workflow. (#1865)

Author: asuessenbach

.github/workflows/ci-macos.yml

@@ -7,12 +7,19 @@ on:
 
 jobs:
   build:
-    runs-on: macos-12
+    runs-on: ${{matrix.os}}
 
     strategy:
       matrix:
+        os: [macos-12, macos-13]
         # g++-12 fails on some very innocent code... excluding it for now
         compiler: [clang++, g++-11, g++-13]
+        exclude:
+          # g++-11 and g++-13 fails on macos-13 with some linker assertion... excluing it for now
+          - os: macos-13
+            compiler: g++-11
+          - os: macos-13
+            compiler: g++-13
 
     steps:
     - uses: actions/checkout@v4