deforaos-c-ci_ubuntu-latest: use checkout v4

Author: khorben

.github/workflows/deforaos-c-ci_ubuntu-latest.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: bootstrap libSystem
       run: git clone https://github.com/DeforaOS/libSystem.git libSystem && for dir in include data src; do (cd libSystem/$dir && make PREFIX="$HOME/opt/DeforaOS" install); done
     - name: bootstrap configure