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

Author: renovate[bot]

.github/workflows/verify.yml

@@ -36,7 +36,7 @@ jobs:
             snowpack-svelte,
           ]
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Setup Node
         uses: actions/setup-node@v3