ci: Update nightly CI to checkout v4

Author: nbdd0121

.github/workflows/nightly.yml

@@ -15,7 +15,7 @@ jobs:
   ci:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         ref: 'nightly'
     - name: Build