Fix Python version setup in GitHub Actions

.github/workflows/ci.yml

@@ -10,7 +10,7 @@ on:
 
 jobs:
   test:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-latest  # Or try ubuntu-22.04 if necessary
 
     steps:
     - name: Checkout code
@@ -19,7 +19,15 @@ jobs:
     - name: Set up Python
       uses: actions/setup-python@v4
       with:
-        python-version: 3.10
+        python-version: '3.10.x'  # Specific version
+
+    - name: Cache Python dependencies
+      uses: actions/cache@v2
+      with:
+        path: ~/.cache/pip
+        key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}
+        restore-keys: |
+          ${{ runner.os }}-pip-
 
     - name: Install dependencies
       run: pip install -r requirements.txt
@@ -28,4 +36,3 @@ jobs:
       env:
         PYTHONPATH: ${{ github.workspace }}
       run: python -m unittest discover -s solutions/tests
-