chore(deps): update actions/checkout action to v4 (#2408)

Author: renovate-bot

.github/workflows/ci.yaml

@@ -92,7 +92,7 @@ jobs:
     name: "units (21)"
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: actions/setup-java@v3
         with:
           java-version: 21