ci: bump macos version

Author: arnaud-roland

.github/workflows/documentation.yml

@@ -20,7 +20,7 @@ jobs:
     environment:
       name: github-pages
       url: ${{ steps.deployment.outputs.page_url }}
-    runs-on: macos-13
+    runs-on: macos-15
     steps:
       - name: Checkout
         uses: actions/checkout@v3