ci: bump actions

.github/workflows/ci.yml

@@ -8,17 +8,15 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v2
-    - name: Set up Python 3.11
+    - uses: actions/checkout@v4
+    - name: Set up Python
       id: setup-python
-      uses: actions/setup-python@v2
-      with:
-        python-version: "3.11"
+      uses: actions/setup-python@v5
     - name: Cache virtualenv
       id: cache-venv
-      uses: actions/cache@v2
+      uses: actions/cache@v4
       with:
         path: .venv
-        key: ${{ runner.os }}-py${{ steps.setup-python.outputs.python-version }}-venv-${{ hashFiles('setup.py') }}
+        key: ${{ runner.os }}-py${{ steps.setup-python.outputs.python-version }}-venv
     - name: make test
       run: make test