Update actions/checkout action to v5

Author: renovate[bot]

.github/workflows/build.yml

@@ -8,7 +8,7 @@ jobs:
   build:
     runs-on: ubuntu-24.04
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - run: ./cli.sh configure_system
       - run: ./cli.sh install_apps
       - run: ./cli.sh install_systemd