Update CI.yml

Author: chita13

.github/workflows/CI.yml

@@ -11,10 +11,10 @@ jobs:
     - uses: actions/checkout@v2
       with:
         ref: ${{github.event.pull_request.head.sha}}
-    - name: Set up Python 3.9.1
-      uses: actions/setup-python@v2
+    - name: Set up Python 3.9.12
+      uses: actions/setup-python@v4
       with:
-        python-version: "3.9.1"
+        python-version: "3.9.12"
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip