Update `actions/setup-python`in CI workflows (#365)

* Update `actions/setup-python`in  CI workflows

.github/workflows/pull_request.yml

@@ -6,8 +6,8 @@ jobs:
   pre-commit:
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v2
-      - uses: actions/setup-python@v2
+      - uses: actions/checkout@v3
+      - uses: actions/setup-python@v4
         with:
           python-version: 3.8
       - uses: pre-commit/action@v2.0.3

.github/workflows/python-app.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Cache
       uses: actions/cache@v2.1.3
       with:
@@ -25,9 +25,9 @@ jobs:
         # An explicit key for restoring and saving the cache
         key: evaldata-cache-4
     - name: Set up Python 3.9
-      uses: actions/setup-python@v2
+      uses: actions/setup-python@v4
       with:
-        python-version: 3.9.7
+        python-version: 3.9
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip