Infra: Use actions/checkout version 4 (#3422)

.github/workflows/lint.yml

@@ -21,7 +21,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Set up Python 3
         uses: actions/setup-python@v4
         with:

.github/workflows/render.yml

@@ -30,7 +30,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           fetch-depth: 0  # fetch all history so that last modified date-times are accurate
 

.github/workflows/test.yml

@@ -40,7 +40,7 @@ jobs:
         - "ubuntu-latest"
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v4
         with: