Update GitHub Action workflows to actions/checkout@v6 (8.2)

Author: TimWolla

.github/workflows/push.yml

@@ -132,7 +132,7 @@ jobs:
           MYSQL_ROOT_PASSWORD: root
     steps:
       - name: git checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: apt
         uses: ./.github/actions/apt-x32
       - name: ccache