Bump from checkout@v2 to v4

Author: giswqs

.github/workflows/ee-test-with-oauth2.yml

@@ -9,7 +9,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v2
+      uses: actions/checkout@v4
 
     - name: Set up Python
       uses: actions/setup-python@v5