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

Author: renovate[bot]

.github/workflows/test.yml

@@ -16,7 +16,7 @@ jobs:
         python-version: [ "3.9", "3.10", "3.11" ]
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           repository: 'ZNotify/py-sdk'