update checkout action

.github/workflows/ci.yml

@@ -67,9 +67,9 @@ jobs:
       matrix:
         python-version: ["3.8", "3.9", "3.10"]
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v3
+      uses: actions/setup-python@v5
       with:
         python-version: ${{ matrix.python-version }}
     - name: Install dependencies
@@ -89,10 +89,10 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Set up Python
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v5
         with:
           python-version: 3.x
 
@@ -112,7 +112,7 @@ jobs:
 
     steps:
     - name: checkout repo
-      uses: actions/checkout@v2
+      uses: actions/checkout@v4
 
     - name: set up ssh keys
       uses: shimataro/ssh-key-action@v2
@@ -130,7 +130,7 @@ jobs:
 
     steps:
     - name: checkout repo
-      uses: actions/checkout@v2
+      uses: actions/checkout@v4
 
     - name: set up ssh keys
       uses: shimataro/ssh-key-action@v2