update to macos-13 runner

Author: DimitrisStaratzis

.github/workflows/github_actions.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ ubuntu-latest, macos-11 ]
+        os: [ ubuntu-latest, macos-13 ]
 
     steps:
       - uses: actions/checkout@v4