[skip-ci] Update actions/checkout action to v4

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

.github/workflows/integration.yml

@@ -13,7 +13,7 @@ jobs:
       - uses: actions/setup-go@v5
         with:
           go-version: '1.21'
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: actions/cache@v4
         with:
           path: |
@@ -34,7 +34,7 @@ jobs:
       - uses: actions/setup-go@v5
         with:
           go-version: '1.21'
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: actions/cache@v4
         with:
           path: |