update github action to newest version

.github/workflows/update-leaderboard.yaml

@@ -9,9 +9,9 @@ jobs:
   update-markdown:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3 # Updated to the latest version at the time of writing
       - name: Set up Python
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v4 
         with:
           python-version: '3.x'
       - name: Install dependencies