Update actions/checkout action to v7 (#409)

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

Author: renovate[bot]

.github/workflows/ci-cd.yml

@@ -21,7 +21,7 @@ jobs:
       - name: Create database and allow user
         run: |
           sudo -u postgres createdb --owner=security_vulnerability_examples security_vulnerability_examples
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
       - uses: pnpm/action-setup@v6
       - uses: actions/setup-node@v6
         with:
@@ -76,6 +76,6 @@ jobs:
     env:
       FLY_API_TOKEN: ${{ secrets.FLY_API_TOKEN }}
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
       - uses: superfly/flyctl-actions/setup-flyctl@master
       - run: flyctl deploy --remote-only