Update actions/checkout action to v7

Author: renovate[bot]

.github/workflows/ci.yml

@@ -14,7 +14,7 @@ jobs:
     steps:
 
       - name: Check Out Repo
-        uses: actions/checkout@v3
+        uses: actions/checkout@v7
 
       - name: Login to DockerHub
         uses: docker/login-action@v2