chore(deps): update actions/checkout action to v6 (#7)

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

Author: renovate[bot]

.github/workflows/ci.yml

@@ -9,7 +9,7 @@ jobs:
 
     steps:
       - name: Download repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Run lint
         run: |

.github/workflows/docker-compose-cd.yml

@@ -19,7 +19,7 @@ jobs:
 
     steps:
       - name: Download repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Install docker compose
         uses: KengoTODA/actions-setup-docker-compose@v1