CI: Use native actions/setup-python caching

.github/workflows/on_pull_request.yaml

@@ -19,22 +19,19 @@ jobs:
       - name: Checkout Code
         uses: actions/checkout@v3
       - name: Set up Python 3.10
-        uses: actions/setup-python@v3
+        uses: actions/setup-python@v4
         with:
           python-version: 3.10.6
-      - uses: actions/cache@v2
-        with:
-          path: ~/.cache/pip
-          key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}
-          restore-keys: |
-            ${{ runner.os }}-pip-
+          cache: pip
+          cache-dependency-path: |
+            **/requirements*txt
       - name: Install PyLint
         run: | 
           python -m pip install --upgrade pip
           pip install pylint
       # This lets PyLint check to see if it can resolve imports
       - name: Install dependencies
-        run : |
+        run: |
           export COMMANDLINE_ARGS="--skip-torch-cuda-test --exit"
           python launch.py
       - name: Analysing the code with pylint